$GFF
GRIFFON CORP Stock $gff

$gff Overview Financials Valuation SEC Filings Company Website

2019 Form 10-K Financial Statement

#000005072519000077 Filed on November 22, 2019

Income Statement

Concept	2019	2018 Q4	2018 Q3
Revenue	$1.874B	$510.5M	$545.5M
YoY Change	-5.24%	16.74%	26.63%
Cost Of Revenue	$1.357B	$367.5M	$397.2M
YoY Change	-7.45%	16.1%	25.58%
Gross Profit	$516.8M	$139.8M	$148.3M
YoY Change	1.08%	15.73%	29.53%
Gross Profit Margin	27.58%	27.38%	27.19%
Selling, General & Admin	$408.3M	$113.8M	$105.6M
YoY Change	-2.43%	6.69%	21.8%
% of Gross Profit	79.01%	81.38%	71.19%
Research & Development	$15.40M
YoY Change	0.0%
% of Gross Profit	2.98%
Depreciation & Amortization	$51.52M	$15.09M	$15.50M
YoY Change	-7.68%	16.41%	34.78%
% of Gross Profit	9.97%	10.79%	10.45%
Operating Expenses	$408.3M	$113.8M	$110.1M
YoY Change	-2.43%	6.69%	22.2%
Operating Profit	$108.5M	$29.29M	$38.24M
YoY Change	16.92%	106.94%	56.6%
Interest Expense	$68.31M	$16.53M	-$15.40M
YoY Change	4.18%	-1.84%	20.31%
% of Operating Profit	62.96%	56.43%	-40.27%
Other Income/Expense, Net	-$62.28M	-$15.33M	$900.0K
YoY Change	5.58%	-5.55%	-40.0%
Pretax Income	$46.22M	$13.97M	$23.70M
YoY Change	36.71%	-773.66%	558.33%
Income Tax	$20.75M	$5.212M	$19.20M
% Of Pretax Income	44.9%	37.32%	81.01%
Net Earnings	$37.29M	$8.753M	-$1.400M
YoY Change	-70.33%	-71.75%	-88.33%
Net Earnings / Revenue	1.99%	1.71%	-0.26%
Basic Earnings Per Share	$0.91	$0.21
Diluted Earnings Per Share	$0.87	$0.21	-$34.74K
COMMON SHARES
Basic Shares Outstanding	40.93M shares	40.75M shares	45.62M shares
Diluted Shares Outstanding	42.89M shares	41.89M shares

Balance Sheet

Concept	2019	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$72.40M	$81.80M	$69.80M
YoY Change	3.72%	-3.08%	46.33%
Cash & Equivalents	$72.40M	$81.75M	$69.76M
Short-Term Investments
Other Short-Term Assets	$41.10M	$39.90M	$42.40M
YoY Change	-3.07%	-90.98%	-89.69%
Inventory	$442.1M	$420.4M	$398.4M
Prepaid Expenses
Receivables	$369.6M	$253.4M	$280.5M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$925.2M	$913.9M	$912.9M
YoY Change	1.35%	-25.02%	-16.87%
LONG-TERM ASSETS
Property, Plant & Equipment	$337.3M	$336.5M	$342.5M
YoY Change	-1.52%	19.86%	47.54%
Goodwill		$438.4M	$439.4M
YoY Change		13.85%	37.68%
Intangibles		$585.6M	$592.7M
YoY Change		38.35%	97.46%
Long-Term Investments		$0.00	$0.00
YoY Change
Other Assets	$18.70M	$14.94M	$16.36M
YoY Change	-3.11%	-4.66%	1.89%
Total Long-Term Assets	$1.150B	$1.172B	$1.172B
YoY Change	-1.9%	21.88%	51.15%
TOTAL ASSETS
Total Short-Term Assets	$925.2M	$913.9M	$912.9M
Total Long-Term Assets	$1.150B	$1.172B	$1.172B
Total Assets	$2.075B	$2.086B	$2.085B
YoY Change	-0.48%	-4.34%	11.28%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$250.6M	$241.9M	$233.7M
YoY Change	7.23%	22.31%	27.02%
Accrued Expenses	$116.9M	$138.4M	$139.2M
YoY Change	-10.9%	17.78%	67.18%
Deferred Revenue		$25.84M
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$10.50M	$12.87M	$13.01M
YoY Change	-19.23%	2.22%	17.45%
Total Short-Term Liabilities	$390.1M	$401.4M	$393.1M
YoY Change	-0.76%	-3.88%	5.93%
LONG-TERM LIABILITIES
Long-Term Debt	$1.094B	$1.142B	$1.108B
YoY Change	-1.3%	-7.78%	14.46%
Other Long-Term Liabilities	$113.3M	$105.1M	$106.7M
YoY Change	3.56%	24.32%	-19.49%
Total Long-Term Liabilities	$1.207B	$1.247B	$1.215B
YoY Change	-0.86%	-5.73%	10.37%
TOTAL LIABILITIES
Total Short-Term Liabilities	$390.1M	$401.4M	$393.1M
Total Long-Term Liabilities	$1.207B	$1.247B	$1.215B
Total Liabilities	$1.597B	$1.617B	$1.610B
YoY Change	-0.83%	-7.36%	9.21%
SHAREHOLDERS EQUITY
Retained Earnings		$544.9M	$550.5M
YoY Change			14.61%
Common Stock			$523.8M
YoY Change			3.26%
Preferred Stock
YoY Change
Treasury Stock (at cost)			$534.8M
YoY Change			9.32%
Treasury Stock Shares			35.85M shares
Shareholders Equity	$477.8M	$471.6M	$474.4M
YoY Change
Total Liabilities & Shareholders Equity	$2.075B	$2.086B	$2.085B
YoY Change	-0.48%	-4.34%	11.28%

Cashflow Statement

Concept	2019	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$37.29M	$8.753M	-$1.400M
YoY Change	-70.33%	-71.75%	-88.33%
Depreciation, Depletion And Amortization	$51.52M	$15.09M	$15.50M
YoY Change	-7.68%	16.41%	34.78%
Cash From Operating Activities	$111.8M	$600.0K	$47.00M
YoY Change	787.3%	-113.64%	46.88%
INVESTING ACTIVITIES
Capital Expenditures	$34.87M	$8.397M	-$17.00M
YoY Change	-30.45%	-22.14%	38.21%
Acquisitions	$9.219M	$9.219M
YoY Change	-97.86%	-95.36%
Other Investing Activities	-$29.20M	-$9.200M	-$400.0K
YoY Change	-169.52%	-95.54%	-98.97%
Cash From Investing Activities	-$74.60M	-$17.60M	-$17.50M
YoY Change	809.76%	-91.89%	-65.95%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$1.478M	$1.348M
YoY Change	-96.76%	-68.88%
Debt Paid & Issued, Net	$218.2M	$4.322M
YoY Change	-27.49%	-91.84%
Cash From Financing Activities	-$34.98M	$28.57M	-18.60M
YoY Change	-189.53%	-88.95%	588.89%
NET CHANGE
Cash From Operating Activities	111.8M	600.0K	47.00M
Cash From Investing Activities	-74.60M	-17.60M	-17.50M
Cash From Financing Activities	-$34.98M	$28.57M	-18.60M
Net Change In Cash	$2.619M	$11.99M	10.90M
YoY Change	-88.14%	-95.36%	-149.32%
FREE CASH FLOW
Cash From Operating Activities	$111.8M	$600.0K	$47.00M
Capital Expenditures	$34.87M	$8.397M	-$17.00M
Free Cash Flow	$76.93M	-$7.797M	$64.00M
YoY Change	-304.94%	-48.65%	44.47%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.25
CY2019Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.25
CY2018Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	3000000	shares
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	7881000	USD
CY2018Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.25
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000050725
CY2019	gff	Completion Period Of Service CompletionPeriodOfService	P1Y
CY2019	gff	Description Of Fair Value Calculation DescriptionOfFairValueCalculation	Griffon used five year projections and a 3.0% terminal value to which discount rates between 9% and 10% were applied to calculate each unit’s fair value.
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.25
CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	85000000	shares
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	85000000	shares
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CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	82775000	shares
CY2018Q3	us-gaap	Customer Advances And Progress Payments For Long Term Contracts Or Programs CustomerAdvancesAndProgressPaymentsForLongTermContractsOrPrograms	3172000	USD
CY2019Q3	us-gaap	Customer Advances And Progress Payments For Long Term Contracts Or Programs CustomerAdvancesAndProgressPaymentsForLongTermContractsOrPrograms	13861000	USD
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CY2019Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	3000000	shares
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CY2019Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018	us-gaap	Research And Development Arrangement Contract To Perform For Others Costs Incurred Gross ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross	15400000	USD
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Description ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription	Options granted under the Incentive Plan may be either “incentive stock options” or nonqualified stock options, generally expire ten years after the date of grant and are granted at an exercise price of not less than 100% of the fair market value at the date of grant.
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	350000	shares
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CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	35969000	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Local Phone Number LocalPhoneNumber	957-5000
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $0.25 par value
CY2019	dei	Trading Symbol TradingSymbol	GFF
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	1-06620
CY2019	dei	Entity Registrant Name EntityRegistrantName	GRIFFON CORP
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	11-1893410
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	712 Fifth Ave, 18th Floor
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10019
CY2019	dei	City Area Code CityAreaCode	212
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
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CY2019	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-2715000	USD
CY2018	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	27558000	USD
CY2017	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	25147000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-8335000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	92423000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2871000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	14912000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.11
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.81
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.43
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.20
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	2.25
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.07
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.91
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.06
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.36
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40934000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41005000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41005000	shares
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.06
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.78
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.41
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.20
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	2.18
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.07
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.96
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.35
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42888000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42422000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43011000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	14912000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-8460000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	9403000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	10667000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	23055000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-16381000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-9203000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-289000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	585000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	890000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31804000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	26369000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20760000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5483000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	152047000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	35672000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	14912000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-8335000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	92423000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2871000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	61848000	USD
CY2018	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	55803000	USD
CY2017	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	47878000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	13285000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	10078000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	8090000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	535000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	96000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	271000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5393000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5219000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	4511000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2222000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-17633000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2341000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	179000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-290000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	126000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-8279000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-2681000	USD
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	19131000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	24938000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	52122000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	29299000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	4285000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2285000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	4781000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	7638000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	11078000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	17541000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2982000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-11732000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-4073000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	113958000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	58192000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	49151000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	45361000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	50138000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	34937000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	9219000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	430932000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	34719000	USD
CY2019	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	149000	USD
CY2018	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	0	USD
CY2017	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	1824000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	-9500000	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	474727000	USD
CY2017	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
CY2019	gff	Proceeds From Payments For Insurance Settlement Investing Activities ProceedsFromPaymentsForInsuranceSettlementInvestingActivities	-10604000	USD
CY2018	gff	Proceeds From Payments For Insurance Settlement Investing Activities ProceedsFromPaymentsForInsuranceSettlementInvestingActivities	8254000	USD
CY2017	gff	Proceeds From Payments For Insurance Settlement Investing Activities ProceedsFromPaymentsForInsuranceSettlementInvestingActivities	0	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	280000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	663000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	143000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-74553000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	2574000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-71337000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	13676000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	49797000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1478000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	10325000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	45605000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	15841000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	201748000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	443058000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	233443000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	218248000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	300993000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	170454000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-366000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	144000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2019	gff	Share Premium Received From Settlement Of Debt Financing Activities SharePremiumReceivedFromSettlementOfDebtFinancingActivities	0	USD
CY2018	gff	Share Premium Received From Settlement Of Debt Financing Activities SharePremiumReceivedFromSettlementOfDebtFinancingActivities	0	USD
CY2017	gff	Share Premium Received From Settlement Of Debt Financing Activities SharePremiumReceivedFromSettlementOfDebtFinancingActivities	24997000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1090000	USD
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	7793000	USD
CY2017	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1548000	USD
CY2019	gff	Payments To Acquire Employee Stock Ownership Plan Shares PaymentsToAcquireEmployeeStockOwnershipPlanShares	0	USD
CY2018	gff	Payments To Acquire Employee Stock Ownership Plan Shares PaymentsToAcquireEmployeeStockOwnershipPlanShares	0	USD
CY2017	gff	Payments To Acquire Employee Stock Ownership Plan Shares PaymentsToAcquireEmployeeStockOwnershipPlanShares	10908000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	1686000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2017	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-180000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	51000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-70000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-34976000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	39065000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-700000	USD
CY2019	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-2123000	USD
CY2018	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-45624000	USD
CY2017	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	47193000	USD
CY2019	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	0	USD
CY2018	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-10762000	USD
CY2017	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-45075000	USD
CY2019	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	0	USD
CY2018	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-22541000	USD
CY2017	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-4268000	USD
CY2019	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-2123000	USD
CY2018	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-78927000	USD
CY2017	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-2150000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	313000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1173000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	164000	USD
CY2019	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	2619000	USD
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	22077000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-24872000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	69758000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47681000	USD
CY2016Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72553000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72377000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	69758000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47681000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	63334000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	59793000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	48137000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	25339000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	32140000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	20998000	USD
CY2016Q3	us-gaap	Stockholders Equity StockholdersEquity	410947000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	14912000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	10325000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Income Tax Deficiency From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation	13738000	USD
CY2017	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	3510000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	22000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2201000	USD
CY2017	gff	Adjustment To Additional Paid In Capital Premium On Settlement Of Convertible Debt AdjustmentToAdditionalPaidInCapitalPremiumOnSettlementOfConvertibleDebt	73855000	USD
CY2017	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	48858000	USD
CY2017	gff	Esop Purchaseof Common Stock ESOPPurchaseofCommonStock	10908000	USD
CY2017	us-gaap	Employee Stock Ownership Plan Esop Gain Loss On Transactions In Deferred Shares EmployeeStockOwnershipPlanESOPGainLossOnTransactionsInDeferredShares	2736000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8090000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20760000	USD
CY2017Q3	us-gaap	Stockholders Equity StockholdersEquity	398808000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	55502000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4495000	USD
CY2018	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	8110000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	41110000	USD
CY2018	us-gaap	Employee Stock Ownership Plan Esop Gain Loss On Transactions In Deferred Shares EmployeeStockOwnershipPlanESOPGainLossOnTransactionsInDeferredShares	4756000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10078000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	26369000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	474391000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	13676000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1106000	USD
CY2019	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	2726000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	372000	USD
CY2019	us-gaap	Employee Stock Ownership Plan Esop Gain Loss On Transactions In Deferred Shares EmployeeStockOwnershipPlanESOPGainLossOnTransactionsInDeferredShares	1512000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13285000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31804000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	477763000	USD
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2018Q3	us-gaap	Environmental Exit Costs Costs Accrued To Date EnvironmentalExitCostsCostsAccruedToDate	5700000	USD
CY2019	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Reclassifications</span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Certain amounts in prior years have been reclassified to conform to the current year presentation.</span></div>
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of estimates</span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div>The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. These estimates may be adjusted due to changes in economic, industry or customer financial conditions, as well as changes in technology or demand. Significant estimates include allowances for doubtful accounts receivable and returns, net realizable value of inventories, restructuring reserves, valuation of goodwill and intangible assets, percentage of completion method of accounting, pension assumptions, useful lives associated with depreciation and amortization of intangible and fixed assets, warranty reserves, sales incentive accruals, stock based compensation assumptions, income taxes and tax valuation reserves, environmental reserves, legal reserves, insurance reserves, the valuation of assets and liabilities of discontinued operations, acquisition assumptions used and the accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions Griffon may undertake in the future. Actual results may ultimately differ from these estimates.
CY2019Q3	gff	Cash In Non Us Bank Accounts CashInNonUsBankAccounts	34200000	USD
CY2018Q3	gff	Cash In Non Us Bank Accounts CashInNonUsBankAccounts	24900000	USD
CY2019Q3	gff	Fair Value Of Insurance Contracts FairValueOfInsuranceContracts	3408000	USD
CY2019	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	4126000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	3500000	CAD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	700000	CAD
CY2019	gff	Contracts Weighted Average Rate Price ContractsWeightedAverageRatePrice	1.32
CY2018	gff	Contracts Weighted Average Rate Price ContractsWeightedAverageRatePrice	1.29
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-14000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-7000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	145319000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-8460000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	9403000	USD
CY2019	gff	Revenue Performance Obligation Satisfied At A Point In Time Percentage RevenuePerformanceObligationSatisfiedAtAPointInTimePercentage	0.80
CY2019	gff	Revenue Performance Obligation Satisfied Over In Time Percentage RevenuePerformanceObligationSatisfiedOverInTimePercentage	0.20
CY2019Q3	gff	Customer Program Reserves And Cash Discounts Netted Against Accounts Receivable CustomerProgramReservesAndCashDiscountsNettedAgainstAccountsReceivable	17322000	USD
CY2018Q3	gff	Customer Program Reserves And Cash Discounts Netted Against Accounts Receivable CustomerProgramReservesAndCashDiscountsNettedAgainstAccountsReceivable	15530000	USD
CY2019Q3	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected After One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedAfterOneYear	13100000	USD
CY2018Q3	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected After One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedAfterOneYear	29500000	USD
CY2018Q3	us-gaap	Contract With Customer Asset Accumulated Allowance For Credit Loss ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss	400000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	51926000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	46733000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	41220000	USD
CY2019Q3	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	2925000	USD
CY2018Q3	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	2896000	USD
CY2017Q3	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	4891000	USD
CY2019Q3	gff	Original Cost Of Fully Depreciated Property Plant And Equipment OriginalCostOfFullyDepreciatedPropertyPlantAndEquipment	229456000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	gff	Fair Value Projections FairValueProjections	P5Y
CY2019	gff	Fair Value Terminal Value FairValueTerminalValue	0.030
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4061000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4519000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4825000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.245
CY2018	gff	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	-20587000	USD
CY2019	gff	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	13100000	USD
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Income Tax Expense TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsIncomeTaxExpense	12699000	USD
CY2019	us-gaap	Research And Development Arrangement Contract To Perform For Others Costs Incurred Gross ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross	15400000	USD
CY2017	us-gaap	Research And Development Arrangement Contract To Perform For Others Costs Incurred Gross ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross	17700000	USD
CY2018Q4	gff	Contract With Customer Asset And Capitalized Contract Cost Net Current ContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	100821000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	420384000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	913917000	USD
CY2018Q4	us-gaap	Assets Assets	2085933000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	241940000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	25841000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	401353000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	105089000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	1617160000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	544905000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	468773000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2085933000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	2209289000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1614020000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	72178000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26556000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	45622000	USD
CY2019Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Current ContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	105111000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	442121000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	925179000	USD
CY2019Q3	us-gaap	Assets Assets	2074939000	USD
CY2019Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	250576000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	26259000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	390099000	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	109997000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	1597176000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	568516000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	477763000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2074939000	USD
CY2019	gff	Revenue Performance Obligation Satisfied At A Point In Time Percentage RevenuePerformanceObligationSatisfiedAtAPointInTimePercentage	0.80
CY2019	gff	Revenue Performance Obligation Satisfied Over In Time Percentage RevenuePerformanceObligationSatisfiedOverInTimePercentage	0.20
CY2019	gff	Contractwith Customer Asset Cumulative Catchup Adjustmentto Revenue ContractwithCustomerAssetCumulativeCatchupAdjustmenttoRevenue	-4500000	USD
CY2018	gff	Contractwith Customer Asset Cumulative Catchup Adjustmentto Revenue ContractwithCustomerAssetCumulativeCatchupAdjustmenttoRevenue	1400000	USD
CY2017	gff	Contractwith Customer Asset Cumulative Catchup Adjustmentto Revenue ContractwithCustomerAssetCumulativeCatchupAdjustmenttoRevenue	600000	USD
CY2019Q3	us-gaap	Capitalized Contract Cost Accumulated Impairment CapitalizedContractCostAccumulatedImpairment	9800000	USD
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	389300000	USD
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.72
CY2019Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Current ContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	105111000	USD
CY2018Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Current ContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	121803000	USD
CY2019	gff	Increase Decrease Contract With Customer Asset And Capitalized Contract Cost Net Current IncreaseDecreaseContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	-16692000	USD
CY2019Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Noncurrent ContractWithCustomerAssetAndCapitalizedContractCostNetNoncurrent	13100000	USD
CY2018Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Noncurrent ContractWithCustomerAssetAndCapitalizedContractCostNetNoncurrent	29500000	USD
CY2019Q3	us-gaap	Contract With Customer Asset Accumulated Allowance For Credit Loss ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss	0	USD
CY2018Q3	us-gaap	Contract With Customer Asset Accumulated Allowance For Credit Loss ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss	400000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	26259000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	8700000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1823497000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax	15070000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2019Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	121791000	USD
CY2018Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	97645000	USD
CY2019Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	93830000	USD
CY2018Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	83578000	USD
CY2019Q3	us-gaap	Inventory Finished Goods InventoryFinishedGoods	226500000	USD
CY2018Q3	us-gaap	Inventory Finished Goods InventoryFinishedGoods	217136000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	442121000	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	398359000	USD
CY2017Q3	us-gaap	Goodwill Goodwill	319139000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	763542000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	725282000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	426216000	USD
CY2018Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	382790000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	337326000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	342492000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	119907000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	349000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	439395000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	300000	USD
CY2019	us-gaap	Goodwill Transfers GoodwillTransfers	0	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-2628000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	437067000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	202682000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	65112000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	205035000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	56060000	USD
CY2019Q3	us-gaap	Indefinite Lived Trademarks IndefiniteLivedTrademarks	219069000	USD
CY2018Q3	us-gaap	Indefinite Lived Trademarks IndefiniteLivedTrademarks	221883000	USD
CY2019Q3	gff	Finite Lived And Infinite Lived Intangible Asset Gross FiniteLivedAndInfiniteLivedIntangibleAssetGross	421751000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	65112000	USD
CY2018Q3	gff	Finite Lived And Infinite Lived Intangible Asset Gross FiniteLivedAndInfiniteLivedIntangibleAssetGross	426918000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	56060000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9922000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9070000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6658000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	9593000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	9387000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	9387000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	9234000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	9208000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	90761000	USD
CY2019Q1	gff	Discontinued Operation Claims Dispute Settlement DiscontinuedOperationClaimsDisputeSettlement	11050000	USD
CY2019Q1	gff	Discontinued Operation Claims Dispute Settlement Net Of Tax DiscontinuedOperationClaimsDisputeSettlementNetOfTax	8335000	USD
CY2019Q2	gff	Discontinued Operation Payment Of Claims Dispute Settlement DiscontinuedOperationPaymentOfClaimsDisputeSettlement	9500000	USD
CY2019	gff	Disposal Group Post Close Adjustment Gross DisposalGroupPostCloseAdjustmentGross	9500000	USD
CY2019	gff	Disposal Group Post Close Adjustment Net DisposalGroupPostCloseAdjustmentNet	7085000	USD
CY2008	gff	Number Of Units Sold NumberOfUnitsSold	11	unit
CY2008	gff	Number Of Closed Units NumberOfClosedUnits	1	unit
CY2008	gff	Number Of Merged Units NumberOfMergedUnits	2	unit
CY2018Q3	us-gaap	Environmental Exit Costs Costs Accrued To Date EnvironmentalExitCostsCostsAccruedToDate	5700000	USD
CY2018Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	50251000	USD
CY2019Q3	us-gaap	Interest Payable Current InterestPayableCurrent	4501000	USD
CY2018Q3	us-gaap	Interest Payable Current InterestPayableCurrent	4776000	USD
CY2019Q3	gff	Accrued Warranties And Rebates Current AccruedWarrantiesAndRebatesCurrent	13171000	USD
CY2018Q3	gff	Accrued Warranties And Rebates Current AccruedWarrantiesAndRebatesCurrent	11227000	USD
CY2019Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	11996000	USD
CY2019Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	61639000	USD
CY2018Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	25329000	USD
CY2019Q3	gff	Accrued Rent Utilities And Freight Current AccruedRentUtilitiesAndFreightCurrent	5326000	USD
CY2018Q3	gff	Accrued Rent Utilities And Freight Current AccruedRentUtilitiesAndFreightCurrent	4830000	USD
CY2019Q3	gff	Accrued Income And Other Taxes Current AccruedIncomeAndOtherTaxesCurrent	7814000	USD
CY2018Q3	gff	Accrued Income And Other Taxes Current AccruedIncomeAndOtherTaxesCurrent	8016000	USD
CY2019Q3	gff	Accrued Marketing And Advertising Current AccruedMarketingAndAdvertisingCurrent	4417000	USD
CY2018Q3	gff	Accrued Marketing And Advertising Current AccruedMarketingAndAdvertisingCurrent	3685000	USD
CY2019Q3	gff	Acquisition Costs Current AcquisitionCostsCurrent	0	USD
CY2018Q3	gff	Acquisition Costs Current AcquisitionCostsCurrent	17448000	USD
CY2019Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	15801000	USD
CY2018Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	13630000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	124665000	USD
CY2018Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	139192000	USD
CY2019	us-gaap	Product Warranty Accrual Period Increase Decrease ProductWarrantyAccrualPeriodIncreaseDecrease	-17218000	USD
CY2018Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8174000	USD
CY2017Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	6236000	USD
CY2019	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	16938000	USD
CY2018	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	8770000	USD
CY2018	us-gaap	Product Warranty Accrual Period Increase Decrease ProductWarrantyAccrualPeriodIncreaseDecrease	-7948000	USD
CY2019	us-gaap	Standard Product Warranty Accrual Additions From Business Acquisition StandardProductWarrantyAccrualAdditionsFromBusinessAcquisition	0	USD
CY2018	us-gaap	Standard Product Warranty Accrual Additions From Business Acquisition StandardProductWarrantyAccrualAdditionsFromBusinessAcquisition	1116000	USD
CY2019Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7894000	USD
CY2018Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8174000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Net Minimum Payments1 CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1	6928000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	382000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	6546000	USD
CY2019Q3	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	3691000	USD
CY2019Q3	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	2855000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	3950000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	2153000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	668000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	157000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	0	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	0	USD
CY2019Q3	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	41742000	USD
CY2019Q3	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	35196000	USD
CY2019Q3	gff	Deferred Interest Charges DeferredInterestCharges	55000	USD
CY2018Q3	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	41742000	USD
CY2018Q3	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	31969000	USD
CY2018Q3	gff	Deferred Interest Charges DeferredInterestCharges	80000	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	3967000	USD
CY2018	us-gaap	Adjustment For Amortization AdjustmentForAmortization	3514000	USD
CY2017	us-gaap	Adjustment For Amortization AdjustmentForAmortization	1683000	USD
CY2006Q4	us-gaap	Payments To Acquire Buildings PaymentsToAcquireBuildings	10000000	USD
CY2006Q4	us-gaap	Long Term Debt Percentage Bearing Fixed Interest Rate LongTermDebtPercentageBearingFixedInterestRate	0.050
CY2019Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1114131000	USD
CY2019Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	867000	USD
CY2019Q3	gff	Long Term Debt Capitalized Fees And Expenses LongTermDebtCapitalizedFeesAndExpenses	10724000	USD
CY2019Q3	us-gaap	Long Term Debt LongTermDebt	1104274000	USD
CY2019Q3	gff	Long Term Debt Gross Current LongTermDebtGrossCurrent	10525000	USD
CY2019Q3	us-gaap	Debt Instrument Unamortized Discount Current DebtInstrumentUnamortizedDiscountCurrent	0	USD
CY2019Q3	gff	Debt Issuance Costs Current Net DebtIssuanceCostsCurrentNet	0	USD
CY2019Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	10525000	USD
CY2019Q3	gff	Longterm Debt Gross Noncurrent1 LongtermDebtGrossNoncurrent1	1103606000	USD
CY2019Q3	us-gaap	Debt Instrument Unamortized Discount Noncurrent DebtInstrumentUnamortizedDiscountNoncurrent	867000	USD
CY2019Q3	gff	Debt Issuance Costs Noncurrent Net DebtIssuanceCostsNoncurrentNet	10724000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1093749000	USD
CY2018Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1134692000	USD
CY2018Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	1220000	USD
CY2018Q3	gff	Long Term Debt Capitalized Fees And Expenses LongTermDebtCapitalizedFeesAndExpenses	14830000	USD
CY2018Q3	us-gaap	Long Term Debt LongTermDebt	1121082000	USD
CY2018Q3	gff	Long Term Debt Gross Current LongTermDebtGrossCurrent	13011000	USD
CY2018Q3	us-gaap	Debt Instrument Unamortized Discount Current DebtInstrumentUnamortizedDiscountCurrent	0	USD
CY2018Q3	gff	Debt Issuance Costs Current Net DebtIssuanceCostsCurrentNet	0	USD
CY2018Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	13011000	USD
CY2018Q3	gff	Longterm Debt Gross Noncurrent1 LongtermDebtGrossNoncurrent1	1121681000	USD
CY2018Q3	us-gaap	Debt Instrument Unamortized Discount Noncurrent DebtInstrumentUnamortizedDiscountNoncurrent	1220000	USD
CY2018Q3	gff	Debt Issuance Costs Noncurrent Net DebtIssuanceCostsNoncurrentNet	14830000	USD
CY2018Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1108071000	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	385000	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	385000	USD
CY2019	us-gaap	Interest Paid InterestPaid	62673000	USD
CY2019	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	270000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5123000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	68066000	USD
CY2018	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.0566
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	549000	USD
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	549000	USD
CY2018	us-gaap	Interest Paid InterestPaid	60349000	USD
CY2018	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	270000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4949000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	65568000	USD
CY2017	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	795000	USD
CY2017	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	795000	USD
CY2017	us-gaap	Interest Paid InterestPaid	47002000	USD
CY2017	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1518000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2993000	USD
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	51513000	USD
CY2019Q3	gff	Debt Agreements Future Minimum Payments Due Next Twelve Months DebtAgreementsFutureMinimumPaymentsDueNextTwelveMonths	10525000	USD
CY2019Q3	gff	Debt Agreements Future Minimum Payments Due In Two Years DebtAgreementsFutureMinimumPaymentsDueInTwoYears	86108000	USD
CY2019Q3	gff	Debt Agreements Future Minimum Payments Due In Three Years DebtAgreementsFutureMinimumPaymentsDueInThreeYears	1016109000	USD
CY2019Q3	gff	Debt Agreements Future Minimum Payments Due In Four Years DebtAgreementsFutureMinimumPaymentsDueInFourYears	441000	USD
CY2019Q3	gff	Debt Agreements Future Minimum Payments Due In Five Years DebtAgreementsFutureMinimumPaymentsDueInFiveYears	217000	USD
CY2019Q3	gff	Debt Agreements Future Minimum Payments Due Thereafter DebtAgreementsFutureMinimumPaymentsDueThereafter	731000	USD
CY2017	gff	Underwriting Fees And Other Expense Capitalized UnderwritingFeesAndOtherExpenseCapitalized	13329000	USD
CY2015Q1	gff	Maximum Percentage Of Equity Interest Of Subsidiaries Borrowings Guaranteed MaximumPercentageOfEquityInterestOfSubsidiariesBorrowingsGuaranteed	0.65
CY2016Q3	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	35092000	USD
CY2016Q3	gff	Amount Of Line Note Available To Purchase Common Stock In Open Market AmountOfLineNoteAvailableToPurchaseCommonStockInOpenMarket	10908000	USD
CY2018	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	621875	shares
CY2012Q4	us-gaap	Debt Instrument Basis Spread On Variable Rate1 DebtInstrumentBasisSpreadOnVariableRate1	0.013
CY2019Q3	us-gaap	Line Of Credit LineOfCredit	0	CAD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	11788000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	11053000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	10079000	USD
CY2019Q3	us-gaap	Postemployment Benefits Liability Current And Noncurrent PostemploymentBenefitsLiabilityCurrentAndNoncurrent	1852000	USD
CY2018Q3	us-gaap	Postemployment Benefits Liability Current And Noncurrent PostemploymentBenefitsLiabilityCurrentAndNoncurrent	1699000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3148000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3649000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1993000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3649000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1993000	USD
CY2019	gff	Change In Discount Rate ChangeInDiscountRate	0.10
CY2018	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	9532000	USD
CY2019	gff	Tax Benefit For Amortization Of Pension Cost TaxBenefitForAmortizationOfPensionCost	221000	USD
CY2018	gff	Tax Benefit For Amortization Of Pension Cost TaxBenefitForAmortizationOfPensionCost	342000	USD
CY2017	gff	Tax Benefit For Amortization Of Pension Cost TaxBenefitForAmortizationOfPensionCost	1170000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	4167000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	14000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2018Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2019Q3	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1.000
CY2018Q1	gff	Adjusted Funding Target Attainment Percent AdjustedFundingTargetAttainmentPercent	0.913
CY2018Q1	gff	Adjusted Funding Target Attainment Percent Threshold AdjustedFundingTargetAttainmentPercentThreshold	0.80
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	2440000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	145319000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	150634000	USD
CY2019	gff	Maximum Compensation Of Proportion MaximumCompensationOfProportion	280000	USD
CY2019	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	2630000	USD
CY2018	gff	Special Dividend Esop Charges SpecialDividendESOPCharges	2588000	USD
CY2017	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	5643000	USD
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	47378000	USD
CY2018Q3	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	40010000	USD
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	3209069	shares
CY2018Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	3157530	shares
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	2259308	shares
CY2018Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	2477385	shares
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	5468377	shares
CY2018Q3	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	5634915	shares
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.245
CY2018	gff	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	-20587000	USD
CY2019	gff	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	13100000	USD
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Income Tax Expense TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsIncomeTaxExpense	12699000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	49723000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	4942000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-1339000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	22455000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	28868000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	18037000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	72178000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	33810000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	16698000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.020
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	28778000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	18188000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-3426000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2222000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-17633000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2341000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26556000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	555000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1085000	USD
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	14160000	USD
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-12714000	USD
CY2017	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-6689000	USD
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	6187000	USD
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	5175000	USD
CY2017	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	3307000	USD
CY2019	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	6209000	USD
CY2018	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	8094000	USD
CY2017	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	2297000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26556000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	555000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1085000	USD
CY2019	gff	Income Tax Benefits Reflected Reversal Of Previously Recorded Tax Liabilities IncomeTaxBenefitsReflectedReversalOfPreviouslyRecordedTaxLiabilities	-576000	USD
CY2018	gff	Income Tax Benefits Reflected Reversal Of Previously Recorded Tax Liabilities IncomeTaxBenefitsReflectedReversalOfPreviouslyRecordedTaxLiabilities	-421000	USD
CY2017	gff	Income Tax Benefits Reflected Reversal Of Previously Recorded Tax Liabilities IncomeTaxBenefitsReflectedReversalOfPreviouslyRecordedTaxLiabilities	-122000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.245
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.066
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.102
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.124
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.036
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.124
CY2019	gff	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential True Up EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialTrueUp	0
CY2018	gff	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential True Up EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialTrueUp	0
CY2017	gff	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential True Up EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialTrueUp	-0.114
CY2019	gff	Effective Income Tax Rate Reconciliation Change In Domestic Manufacturing Deduction Percent EffectiveIncomeTaxRateReconciliationChangeInDomesticManufacturingDeductionPercent	0.007
CY2018	gff	Effective Income Tax Rate Reconciliation Change In Domestic Manufacturing Deduction Percent EffectiveIncomeTaxRateReconciliationChangeInDomesticManufacturingDeductionPercent	0
CY2017	gff	Effective Income Tax Rate Reconciliation Change In Domestic Manufacturing Deduction Percent EffectiveIncomeTaxRateReconciliationChangeInDomesticManufacturingDeductionPercent	-0.058
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	-0.007
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	-0.006
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.007
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.600
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.010
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.616
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0
CY2019	gff	Effective Income Tax Rate Reconciliation Valuation Allowance EffectiveIncomeTaxRateReconciliationValuationAllowance	0.033
CY2018	gff	Effective Income Tax Rate Reconciliation Valuation Allowance EffectiveIncomeTaxRateReconciliationValuationAllowance	0.134
CY2017	gff	Effective Income Tax Rate Reconciliation Valuation Allowance EffectiveIncomeTaxRateReconciliationValuationAllowance	-0.006
CY2019	gff	Effective Income Tax Rate Reconciliation Nondeductible Nontaxable Items Net EffectiveIncomeTaxRateReconciliationNondeductibleNontaxableItemsNet	0.031
CY2018	gff	Effective Income Tax Rate Reconciliation Nondeductible Nontaxable Items Net EffectiveIncomeTaxRateReconciliationNondeductibleNontaxableItemsNet	-0.052
CY2017	gff	Effective Income Tax Rate Reconciliation Nondeductible Nontaxable Items Net EffectiveIncomeTaxRateReconciliationNondeductibleNontaxableItemsNet	0.076
CY2019	gff	Effective Income Tax Rate Reconciliation Nondeductible Expense Officer Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent	0.052
CY2018	gff	Effective Income Tax Rate Reconciliation Nondeductible Expense Officer Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent	0.064
CY2017	gff	Effective Income Tax Rate Reconciliation Nondeductible Expense Officer Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent	0.007
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.047
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.394
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.036
CY2019	gff	Effective Income Tax Rate Reconciliation Accounting Changesand Other Adjustments Percent EffectiveIncomeTaxRateReconciliationAccountingChangesandOtherAdjustmentsPercent	0.004
CY2018	gff	Effective Income Tax Rate Reconciliation Accounting Changesand Other Adjustments Percent EffectiveIncomeTaxRateReconciliationAccountingChangesandOtherAdjustmentsPercent	-0.038
CY2017	gff	Effective Income Tax Rate Reconciliation Accounting Changesand Other Adjustments Percent EffectiveIncomeTaxRateReconciliationAccountingChangesandOtherAdjustmentsPercent	-0.266
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.011
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.091
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.025
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.368
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.016
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.065
CY2019Q3	gff	Deferred Tax Assets Bad Debt Reserves DeferredTaxAssetsBadDebtReserves	1980000	USD
CY2018Q3	gff	Deferred Tax Assets Bad Debt Reserves DeferredTaxAssetsBadDebtReserves	1404000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	8361000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	7709000	USD
CY2019Q3	gff	Deferred Tax Assets Deferred Compensation DeferredTaxAssetsDeferredCompensation	16544000	USD
CY2018Q3	gff	Deferred Tax Assets Deferred Compensation DeferredTaxAssetsDeferredCompensation	11437000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	5186000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	5434000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	1873000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	1782000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Warranty Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves	2896000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Warranty Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves	2598000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	11077000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	10593000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	9373000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	6379000	USD
CY2019Q3	gff	Deferred Tax Assets Capital Loss Carryback DeferredTaxAssetsCapitalLossCarryback	2000000	USD
CY2018Q3	gff	Deferred Tax Assets Capital Loss Carryback DeferredTaxAssetsCapitalLossCarryback	0	USD
CY2019Q3	gff	Deferred Tax Assets Interest DeferredTaxAssetsInterest	5250000	USD
CY2018Q3	gff	Deferred Tax Assets Interest DeferredTaxAssetsInterest	0	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	3738000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	5433000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	68278000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	52769000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	10823000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	8520000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	57455000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	44249000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	42477000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	44402000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	43996000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	39260000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1096000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1086000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	87569000	USD
CY2018Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	84748000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	30114000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	40499000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	2302000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	30114000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	40499000	USD
CY2019Q3	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	83002000	USD
CY2019Q3	gff	Deferred Tax Assets Valuation Allowance Net Operating Loss Carryforward And Federal Credits Portion DeferredTaxAssetsValuationAllowanceNetOperatingLossCarryforwardAndFederalCreditsPortion	10823000	USD
CY2018Q3	gff	Deferred Tax Assets Valuation Allowance Net Operating Loss Carryforward And Federal Credits Portion DeferredTaxAssetsValuationAllowanceNetOperatingLossCarryforwardAndFederalCreditsPortion	8520000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4825000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	152000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	253000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	26000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	194000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	37000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4519000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	117000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	559000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	16000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4061000	USD
CY2019	gff	Potential Tax Benefits Impact On Effective Tax Rate PotentialTaxBenefitsImpactOnEffectiveTaxRate	790000	USD
CY2019Q3	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	66000	USD
CY2018Q3	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	122000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.29
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.24
CY2016Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2016Q1	gff	Maximum Percentage Of Exercise Price At Grand Date Fair Value MaximumPercentageOfExercisePriceAtGrandDateFairValue	1
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13285000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10078000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8090000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2115000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2036000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2836000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	11170000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	8042000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5254000	USD
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	350000	shares
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	20.00
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	4748000	USD
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	11216000	USD
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	29508000	USD
CY2019Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	20358000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y10M24D
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	3984510	shares
CY2016Q3	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	50000000	USD
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	37500	shares
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	372000	USD
CY2019	gff	Stock Repurchased During Period Per Share StockRepurchasedDuringPeriodPerShare	9.92
CY2019Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	57955000	USD
CY2019	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	85847	shares
CY2019	gff	Shares Paid For Tax Withholding For Share Based Compensation Value SharesPaidForTaxWithholdingForShareBasedCompensationValue	1059000	USD
CY2019	gff	Shares Paid For Tax Withholding For Share Based Compensation Value Per Share SharesPaidForTaxWithholdingForShareBasedCompensationValuePerShare	12.34
CY2018Q2	gff	Common Stock Numberof Shares Heldby Shareholder CommonStockNumberofSharesHeldbyShareholder	5583375	shares
CY2018	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	621875	shares
CY2019	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	37068000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	35726000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	26297000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	35176000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	30730000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	26119000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	20008000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	14198000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	78105000	USD
CY2019	gff	Long Term Purchase Commitment Purchases Under Commitment During Period LongTermPurchaseCommitmentPurchasesUnderCommitmentDuringPeriod	226026000	USD
CY2018	gff	Long Term Purchase Commitment Purchases Under Commitment During Period LongTermPurchaseCommitmentPurchasesUnderCommitmentDuringPeriod	209924000	USD
CY2017	gff	Long Term Purchase Commitment Purchases Under Commitment During Period LongTermPurchaseCommitmentPurchasesUnderCommitmentDuringPeriod	213674000	USD
CY2019Q3	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	239365000	USD
CY2019Q3	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	2045000	USD
CY2019Q3	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	42000	USD
CY2019Q3	us-gaap	Purchase Obligation Due In Fourth Year PurchaseObligationDueInFourthYear	15000	USD
CY2019Q3	us-gaap	Purchase Obligation Due In Fifth Year PurchaseObligationDueInFifthYear	0	USD
CY2009Q3	gff	Net Capital Cost Value In Proposed Remedial Action Plan NetCapitalCostValueInProposedRemedialActionPlan	10000000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40934000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41005000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41005000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1954000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1417000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1642000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	364000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42888000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42422000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43011000	shares
CY2018Q2	gff	Common Stock Numberof Shares Heldby Shareholder CommonStockNumberofSharesHeldbyShareholder	5583375	shares
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.16
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.15
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	574970000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	510522000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	143046000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	8753000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.21
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.21
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	549633000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	137504000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	6490000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	154483000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	14128000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.34
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.33
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	574164000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	160236000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	16251000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.40
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.37
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2209289000	USD
CY2019	us-gaap	Gross Profit GrossProfit	595269000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	45622000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.11
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.06
CY2017Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	437303000	USD
CY2017Q4	us-gaap	Gross Profit GrossProfit	120779000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	22831000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.54
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.53
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	478560000	USD
CY2018Q1	us-gaap	Gross Profit GrossProfit	121379000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	1951000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.05
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.05
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	516550000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	138682000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	7442000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.18
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.18
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.81
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	545505000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	148341000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	1031000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.03
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.02
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1977918000	USD
CY2018	us-gaap	Gross Profit GrossProfit	529181000	USD
CY2018	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	33255000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.78
CY2019Q3	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1333000	USD
CY2017Q4	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2348000	USD
CY2018Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	378000	USD
CY2018Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2320000	USD
CY2017Q4	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	248000	USD
CY2018Q2	gff	Special Dividend Esop Charges SpecialDividendESOPCharges	2125000	USD
CY2018Q2	gff	Equity Offering Costs EquityOfferingCosts	795000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2209289000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1977918000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1524997000	USD
CY2019	gff	Segment Profit Before Depreciation Amortization Restructuring Fair Value Writeup Of Acquired Inventory Sold And Acquisition Costs SegmentProfitBeforeDepreciationAmortizationRestructuringFairValueWriteupOfAcquiredInventorySoldAndAcquisitionCosts	245942000	USD
CY2018	gff	Segment Profit Before Depreciation Amortization Restructuring Fair Value Writeup Of Acquired Inventory Sold And Acquisition Costs SegmentProfitBeforeDepreciationAmortizationRestructuringFairValueWriteupOfAcquiredInventorySoldAndAcquisitionCosts	213463000	USD
CY2017	gff	Segment Profit Before Depreciation Amortization Restructuring Fair Value Writeup Of Acquired Inventory Sold And Acquisition Costs SegmentProfitBeforeDepreciationAmortizationRestructuringFairValueWriteupOfAcquiredInventorySoldAndAcquisitionCosts	172697000	USD
CY2019	gff	Earnings Before Income Tax Depreciation And Amortization Continuing Operations EarningsBeforeIncomeTaxDepreciationAndAmortizationContinuingOperations	-46302000	USD
CY2018	gff	Earnings Before Income Tax Depreciation And Amortization Continuing Operations EarningsBeforeIncomeTaxDepreciationAndAmortizationContinuingOperations	-45343000	USD
CY2017	gff	Earnings Before Income Tax Depreciation And Amortization Continuing Operations EarningsBeforeIncomeTaxDepreciationAndAmortizationContinuingOperations	-41918000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-67260000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-63871000	USD
CY2017	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-51449000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61848000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	55803000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	47878000	USD
CY2019	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-1646000	USD
CY2018	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	USD
CY2017	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	33810000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	16698000	USD
CY2019	gff	Segment Depreciation And Amortization SegmentDepreciationAndAmortization	61290000	USD
CY2018	gff	Segment Depreciation And Amortization SegmentDepreciationAndAmortization	55334000	USD
CY2019	us-gaap	Acquisition Costs AcquisitionCosts	0	USD
CY2018	us-gaap	Acquisition Costs AcquisitionCosts	7597000	USD
CY2017	us-gaap	Acquisition Costs AcquisitionCosts	9617000	USD
CY2019	gff	Equity Offering Costs EquityOfferingCosts	0	USD
CY2018	gff	Equity Offering Costs EquityOfferingCosts	1205000	USD
CY2017	gff	Equity Offering Costs EquityOfferingCosts	0	USD
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	USD
CY2018	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	USD
CY2017	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	-5137000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	72178000	USD
CY2017	gff	Segment Depreciation And Amortization SegmentDepreciationAndAmortization	47398000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61848000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	55803000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	47878000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	45361000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	50138000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	34937000	USD
CY2019Q3	gff	Assets Of Continuing Operations AssetsOfContinuingOperations	2071730000	USD
CY2018Q3	gff	Assets Of Continuing Operations AssetsOfContinuingOperations	2081650000	USD
CY2017Q3	gff	Assets Of Continuing Operations AssetsOfContinuingOperations	1499528000	USD
CY2019Q3	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	3209000	USD
CY2018Q3	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	3240000	USD
CY2017Q3	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	374013000	USD
CY2019Q3	us-gaap	Assets Assets	2074939000	USD
CY2018Q3	us-gaap	Assets Assets	2084890000	USD
CY2017Q3	us-gaap	Assets Assets	1873541000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	2209289000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	2209289000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-8460000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	9403000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1977918000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1524997000	USD
CY2019Q3	gff	Property Plant Equipment And Intangible Assets Excluding Goodwill Net PropertyPlantEquipmentAndIntangibleAssetsExcludingGoodwillNet	693965000	USD
CY2018Q3	gff	Property Plant Equipment And Intangible Assets Excluding Goodwill Net PropertyPlantEquipmentAndIntangibleAssetsExcludingGoodwillNet	713350000	USD
CY2017Q3	gff	Property Plant Equipment And Intangible Assets Excluding Goodwill Net PropertyPlantEquipmentAndIntangibleAssetsExcludingGoodwillNet	437262000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	608000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-200000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-723000	USD
CY2019	us-gaap	Investment Income Net InvestmentIncomeNet	-40000	USD
CY2018	us-gaap	Investment Income Net InvestmentIncomeNet	1184000	USD
CY2017	us-gaap	Investment Income Net InvestmentIncomeNet	53000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-8460000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	9403000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	10667000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	10667000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	30581000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	7526000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	23055000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-24081000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-7700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-16381000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-14160000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-4957000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-9203000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	-413000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-124000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-289000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	900000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	315000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	585000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	1370000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	480000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	890000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-39454000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-7650000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31804000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	34384000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	8015000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	26369000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	26197000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	5437000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20760000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-65916000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-34112000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	14912000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31804000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20760000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	26369000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-902000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-1397000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-3343000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5483000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	152047000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	35672000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	1932000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	657000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1458000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	1030000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	-740000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	-4801000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	216000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-155000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-1680000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	814000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	-585000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	-3121000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72377000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	264450000	USD
CY2019Q3	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	105111000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	442121000	USD
CY2019Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	40799000	USD
CY2019Q3	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	321000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	925179000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	337326000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	437067000	USD
CY2019Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	356639000	USD
CY2019Q3	gff	Intercompany Receivables IntercompanyReceivables	0	USD
CY2019Q3	us-gaap	Equity Method Investments EquityMethodInvestments	0	USD
CY2019Q3	us-gaap	Assets Assets	2074939000	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	15840000	USD
CY2019Q3	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Assets DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets	2888000	USD
CY2019Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	10525000	USD
CY2019Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	375241000	USD
CY2019Q3	us-gaap	Disposal Group Including Discontinued Operation Accrued Liabilities DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities	4333000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	390099000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1093749000	USD
CY2019Q3	gff	Intercompany Payables IntercompanyPayables	0	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	109997000	USD
CY2019Q3	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	3331000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	1597176000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	477763000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2074939000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	69758000	USD
CY2018Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	280509000	USD
CY2018Q3	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	121803000	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	398359000	USD
CY2018Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	42121000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	324000	USD
CY2018Q3	us-gaap	Assets Current AssetsCurrent	912874000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	342492000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	439395000	USD
CY2018Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	370858000	USD
CY2018Q3	gff	Intercompany Receivables IntercompanyReceivables	0	USD
CY2018Q3	us-gaap	Equity Method Investments EquityMethodInvestments	0	USD
CY2018Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	16355000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Assets DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets	2916000	USD
CY2018Q3	us-gaap	Assets Assets	2084890000	USD
CY2018Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	13011000	USD
CY2018Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	372850000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Accrued Liabilities DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities	7210000	USD
CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	393071000	USD
CY2018Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1108071000	USD
CY2018Q3	gff	Intercompany Payables IntercompanyPayables	0	USD
CY2018Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	106710000	USD
CY2018Q3	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	2647000	USD
CY2018Q3	us-gaap	Liabilities Liabilities	1610499000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	474391000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2084890000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2209289000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1614020000	USD
CY2019	us-gaap	Gross Profit GrossProfit	595269000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-8335000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	460004000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	135265000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-67260000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4173000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-63087000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	72178000	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-11050000	USD
CY2019	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-2715000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26556000	USD
CY2019	gff	Income Lossfrom Continuing Operations Before Equity Method Investments Netof Tax Attributableto Parent IncomeLossfromContinuingOperationsBeforeEquityMethodInvestmentsNetofTaxAttributabletoParent	45622000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	45622000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5483000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1977918000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1448737000	USD
CY2018	us-gaap	Gross Profit GrossProfit	529181000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	436380000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	92801000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-63871000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4880000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-58991000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	33810000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	555000	USD
CY2018	gff	Income Lossfrom Continuing Operations Before Equity Method Investments Netof Tax Attributableto Parent IncomeLossfromContinuingOperationsBeforeEquityMethodInvestmentsNetofTaxAttributabletoParent	33255000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2018	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	33255000	USD
CY2018	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	119981000	USD
CY2018	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	27558000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	92423000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	152047000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1524997000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1116871000	USD
CY2017	us-gaap	Gross Profit GrossProfit	408126000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	341092000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	67034000	USD
CY2017	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-51449000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1113000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-50336000	USD
CY2017	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	25147000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72377000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2871000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	14912000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	35672000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	92423000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	58192000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	50138000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	430932000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16698000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1085000	USD
CY2017	gff	Income Lossfrom Continuing Operations Before Equity Method Investments Netof Tax Attributableto Parent IncomeLossfromContinuingOperationsBeforeEquityMethodInvestmentsNetofTaxAttributabletoParent	17783000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2017	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	17783000	USD
CY2017	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	22276000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-8335000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	113958000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	45361000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	9219000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	-9500000	USD
CY2019	gff	Proceeds From Payments For Insurance Settlement Investing Activities ProceedsFromPaymentsForInsuranceSettlementInvestingActivities	-10604000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	280000	USD
CY2019	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	149000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-74553000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1478000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	201748000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	218248000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-366000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1090000	USD
CY2019	gff	Proceeds From Tax Benefit From Exercise Of Options And Vesting Of Restricted Stock ProceedsFromTaxBenefitFromExerciseOfOptionsAndVestingOfRestrictedStock	1686000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	13676000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-180000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-34976000	USD
CY2019	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-2123000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	313000	USD
CY2019	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	2619000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	69758000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47681000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	69758000	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	474727000	USD
CY2018	gff	Proceeds From Payments For Insurance Settlement Investing Activities ProceedsFromPaymentsForInsuranceSettlementInvestingActivities	8254000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	663000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	45605000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	2574000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	300993000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	144000	USD
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	7793000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	49797000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	443058000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	51000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	34719000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	39065000	USD
CY2018	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-78927000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1173000	USD
CY2017	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	1824000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	143000	USD
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	22077000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	49151000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	34937000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	14912000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2871000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-71337000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	15841000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	233443000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	170454000	USD
CY2017	gff	Share Premium Received From Settlement Of Debt Financing Activities SharePremiumReceivedFromSettlementOfDebtFinancingActivities	24997000	USD
CY2017	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1548000	USD
CY2017	gff	Proceeds From Tax Benefit From Exercise Of Options And Vesting Of Restricted Stock ProceedsFromTaxBenefitFromExerciseOfOptionsAndVestingOfRestrictedStock	-10908000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	10325000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-70000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-700000	USD
CY2017	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-2150000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	164000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-24872000	USD
CY2016Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72553000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47681000	USD

Files In Submission

Name	View Source	Status
0000050725-19-000077-index-headers.html	Edgar Link	pending
0000050725-19-000077-index.html	Edgar Link	pending
0000050725-19-000077.txt	Edgar Link	pending
0000050725-19-000077-xbrl.zip	Edgar Link	pending
chart-d1bf17ff776f5acf822.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
gff-20190930.xsd	Edgar Link	pending
gff-20190930x10k.htm	Edgar Link	pending
gff-20190930x10k_htm.xml	Edgar Link	completed
gff-20190930_cal.xml	Edgar Link	unprocessable
gff-20190930_def.xml	Edgar Link	unprocessable
gff-20190930_lab.xml	Edgar Link	unprocessable
gff-20190930_pre.xml	Edgar Link	unprocessable
gff-2019x09x30x19xexhibit21.htm	Edgar Link	pending
gff-2019x09x30xexhibit311.htm	Edgar Link	pending
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$GFF
GRIFFON CORP Stock $gff

2019 Form 10-K Financial Statement

#000005072519000077 Filed on November 22, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GFF GRIFFON CORP Stock $gff

2019 Form 10-K Financial Statement

#000005072519000077 Filed on November 22, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GFF
GRIFFON CORP Stock $gff