$GFF
GRIFFON CORP Stock $gff

$gff Overview Financials Valuation SEC Filings Company Website

2020 Q3 Form 10-K Financial Statement

#000005072520000063 Filed on November 13, 2020

Income Statement

Concept	2020 Q3	2020	2019 Q3
Revenue	$660.7M	$2.067B	$574.2M
YoY Change	15.07%	10.26%	5.25%
Cost Of Revenue	$486.2M	$1.483B	$425.7M
YoY Change	14.21%	9.22%	7.18%
Gross Profit	$174.5M	$584.0M	$158.5M
YoY Change	10.1%	12.99%	6.82%
Gross Profit Margin	26.41%	28.26%	27.6%
Selling, General & Admin	$123.7M	$444.5M	$98.90M
YoY Change	25.08%	8.84%	-6.34%
% of Gross Profit	70.9%	76.11%	62.41%
Research & Development		$15.40M
YoY Change		0.0%
% of Gross Profit		2.64%
Depreciation & Amortization	$15.30M	$52.10M	$15.60M
YoY Change	-1.92%	1.13%	0.65%
% of Gross Profit	8.77%	8.92%	9.84%
Operating Expenses	$128.6M	$444.5M	$103.7M
YoY Change	24.01%	8.84%	-5.81%
Operating Profit	$45.87M	$139.5M	$54.76M
YoY Change	-16.23%	28.6%	43.19%
Interest Expense	-$16.70M	$66.54M	-$16.50M
YoY Change	1.21%	-2.59%	7.14%
% of Operating Profit	-36.41%	47.69%	-30.13%
Other Income/Expense, Net	-$800.0K	-$70.84M	-$100.0K
YoY Change	700.0%	13.73%	-111.11%
Pretax Income	$28.40M	$68.71M	$28.10M
YoY Change	1.07%	48.64%	18.57%
Income Tax	$8.300M	$26.26M	$11.90M
% Of Pretax Income	29.23%	38.22%	42.35%
Net Earnings	$20.10M	$53.43M	$16.10M
YoY Change	24.84%	43.29%	-1250.0%
Net Earnings / Revenue	3.04%	2.59%	2.8%
Basic Earnings Per Share		$1.25
Diluted Earnings Per Share	$413.6K	$1.19	$369.3K
COMMON SHARES
Basic Shares Outstanding		42.59M shares	46.80M shares
Diluted Shares Outstanding		45.02M shares

Balance Sheet

Concept	2020 Q3	2020	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$218.1M	$218.1M	$72.40M
YoY Change	201.24%	201.24%	3.72%
Cash & Equivalents	$218.1M	$218.1M	$72.38M
Short-Term Investments
Other Short-Term Assets	$49.00M	$49.00M	$41.10M
YoY Change	19.22%	19.22%	-3.07%
Inventory	$320.2M	$413.8M	$442.1M
Prepaid Expenses
Receivables	$278.4M	$425.0M	$264.5M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$1.106B	$1.106B	$925.2M
YoY Change	19.55%	19.53%	1.35%
LONG-TERM ASSETS
Property, Plant & Equipment	$505.6M	$505.6M	$337.3M
YoY Change	49.88%	49.9%	-1.51%
Goodwill	$424.1M		$418.5M
YoY Change	1.33%		-4.75%
Intangibles	$578.3M		$575.7M
YoY Change	0.44%		-2.87%
Long-Term Investments	$0.00		$0.00
YoY Change
Other Assets	$26.47M	$39.30M	$15.84M
YoY Change	67.13%	110.16%	-3.15%
Total Long-Term Assets	$1.343B	$1.343B	$1.150B
YoY Change	16.77%	16.77%	-1.9%
TOTAL ASSETS
Total Short-Term Assets	$1.106B	$1.106B	$925.2M
Total Long-Term Assets	$1.343B	$1.343B	$1.150B
Total Assets	$2.449B	$2.448B	$2.075B
YoY Change	18.01%	18.0%	-0.48%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$172.5M	$232.1M	$250.6M
YoY Change	-31.14%	-7.38%	7.24%
Accrued Expenses	$144.0M	$195.8M	$124.7M
YoY Change	15.49%	67.49%	-10.44%
Deferred Revenue	$24.39M		$26.26M
YoY Change	-7.13%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$9.922M	$9.900M	$10.53M
YoY Change	-5.73%	-5.71%	-19.11%
Total Short-Term Liabilities	$441.8M	$441.7M	$390.1M
YoY Change	13.26%	13.23%	-0.76%
LONG-TERM LIABILITIES
Long-Term Debt	$1.037B	$1.037B	$1.094B
YoY Change	-5.18%	-5.18%	-1.29%
Other Long-Term Liabilities	$121.5M	$269.6M	$110.0M
YoY Change	10.49%	137.95%	3.08%
Total Long-Term Liabilities	$1.159B	$1.307B	$1.204B
YoY Change	-3.75%	8.25%	-0.91%
TOTAL LIABILITIES
Total Short-Term Liabilities	$441.8M	$441.7M	$390.1M
Total Long-Term Liabilities	$1.159B	$1.307B	$1.204B
Total Liabilities	$1.748B	$1.748B	$1.597B
YoY Change	9.47%	9.46%	-0.83%
SHAREHOLDERS EQUITY
Retained Earnings	$607.5M		$568.5M
YoY Change	6.86%		3.27%
Common Stock	$603.9M		$539.7M
YoY Change	11.9%		3.04%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$413.5M		$536.3M
YoY Change	-22.9%		0.28%
Treasury Stock Shares	27.61M shares		35.97M shares
Shareholders Equity	$700.2M	$700.2M	$477.8M
YoY Change
Total Liabilities & Shareholders Equity	$2.449B	$2.448B	$2.075B
YoY Change	18.01%	18.0%	-0.48%

Cashflow Statement

Concept	2020 Q3	2020	2019 Q3
OPERATING ACTIVITIES
Net Income	$20.10M	$53.43M	$16.10M
YoY Change	24.84%	43.29%	-1250.0%
Depreciation, Depletion And Amortization	$15.30M	$52.10M	$15.60M
YoY Change	-1.92%	1.13%	0.65%
Cash From Operating Activities	$81.00M	$134.0M	$100.7M
YoY Change	-19.56%	19.86%	114.26%
INVESTING ACTIVITIES
Capital Expenditures	-$14.20M	$41.17M	-$17.60M
YoY Change	-19.32%	18.06%	3.53%
Acquisitions		$10.53M
YoY Change		14.23%
Other Investing Activities	$0.00	-$9.900M	$200.0K
YoY Change	-100.0%	-66.1%	-150.0%
Cash From Investing Activities	-$14.20M	-$58.90M	-$17.40M
YoY Change	-18.39%	-21.05%	-0.57%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		-$170.7M
YoY Change		-11648.44%
Debt Paid & Issued, Net		$1.309B
YoY Change		499.74%
Cash From Financing Activities	77.50M	$68.19M	-68.90M
YoY Change	-212.48%	-294.96%	270.43%
NET CHANGE
Cash From Operating Activities	81.00M	134.0M	100.7M
Cash From Investing Activities	-14.20M	-58.90M	-17.40M
Cash From Financing Activities	77.50M	$68.19M	-68.90M
Net Change In Cash	144.3M	$145.7M	14.40M
YoY Change	902.08%	5463.65%	32.11%
FREE CASH FLOW
Cash From Operating Activities	$81.00M	$134.0M	$100.7M
Capital Expenditures	-$14.20M	$41.17M	-$17.60M
Free Cash Flow	$95.20M	$92.83M	$118.3M
YoY Change	-19.53%	20.67%	84.84%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000050725
CY2020	gff	Completion Period Of Service CompletionPeriodOfService	P1Y
CY2019Q3	gff	Contract With Customer Asset Accumulated Progress Payments Current ContractWithCustomerAssetAccumulatedProgressPaymentsCurrent	11259000	USD
CY2020Q3	gff	Contract With Customer Asset Accumulated Progress Payments Current ContractWithCustomerAssetAccumulatedProgressPaymentsCurrent	24175000	USD
CY2020	gff	Fair Value Projection Term FairValueProjectionTerm	P5Y
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	7881000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	17758000	USD
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.25
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.25
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	85000000	shares
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	85000000	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	82775000	shares
CY2020Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	83739000	shares
CY2020Q3	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtCurrent
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtNoncurrent
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:PropertyPlantAndEquipmentNet
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.25
CY2020Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.25
CY2019Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	3000000	shares
CY2020Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	3000000	shares
CY2019Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q3	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
CY2019	us-gaap	Research And Development Arrangement Contract To Perform For Others Costs Incurred Gross ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross	15400000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Trading Symbol TradingSymbol	GFF
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
CY2018Q3	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	50000000	USD
CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	35969000	shares
CY2020Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	27610000	shares
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.25 par value
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-06620
CY2020	dei	Entity Registrant Name EntityRegistrantName	GRIFFON CORP
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	11-1893410
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	712 Fifth Ave, 18th Floor
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10019
CY2020	dei	City Area Code CityAreaCode	212
CY2020	dei	Local Phone Number LocalPhoneNumber	957-5000
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q1	dei	Entity Public Float EntityPublicFloat	527000000	USD
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CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	218089000	USD
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CY2020Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Current ContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	84426000	USD
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CY2020Q3	us-gaap	Goodwill Goodwill	442643000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	437067000	USD
CY2020Q3	us-gaap	Assets Assets	2456017000	USD
CY2019Q3	us-gaap	Assets Assets	2074939000	USD
CY2020Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	9922000	USD
CY2019Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	10525000	USD
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CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	124665000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	413825000	USD
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CY2020Q3	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	2091000	USD
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CY2020Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-64133000	USD
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CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29328000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26556000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	555000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	53429000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	45622000	USD
CY2018	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	33255000	USD
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	0	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-11050000	USD
CY2018	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	119981000	USD
CY2020	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
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
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	53429000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.25
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.11
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.06
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42588000	shares
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
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.19
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
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
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
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.19
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-8460000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	9403000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	11784000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	53429000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.96
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45015000	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
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	5601000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	23055000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-16381000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	7000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-289000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	585000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6176000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-31804000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	26369000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	47253000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5483000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	152047000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	53429000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	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
CY2020	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	62409000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	61848000	USD
CY2018	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	55803000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	17580000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	15914000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	19610000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	4692000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1332000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	535000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	96000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3661000	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
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-7925000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2095000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2222000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-17633000	USD
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	287000	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
CY2020	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	62366000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-8279000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-2681000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-34080000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	24938000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	52122000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	13582000	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
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	25044000	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
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-1017000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-353000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2200000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	137029000	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
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	48998000	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
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	10531000	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
CY2020	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	130000	USD
CY2019	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	149000	USD
CY2018	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	0	USD
CY2020	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	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
CY2020	gff	Proceeds From Payments For Insurance Settlement Investing Activities ProceedsFromPaymentsForInsuranceSettlementInvestingActivities	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
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	352000	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
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-59307000	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
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	178165000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	14529000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	13676000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	49797000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7479000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1478000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	45605000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1240080000	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
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1308915000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	218248000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	300993000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	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
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	17384000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1090000	USD
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	7793000	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	1733000	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
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-15000	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
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	68190000	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
CY2020	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-3021000	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
CY2020	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	444000	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
CY2020	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	0	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
CY2020	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-2577000	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
CY2020	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	2377000	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
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	145712000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2619000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	22077000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	72377000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	69758000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	47681000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	218089000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	72377000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	69758000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	63139000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	63334000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	59793000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	21016000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	25339000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	32140000	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	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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	53429000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	14427000	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	7479000	USD
CY2020	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	2515000	USD
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	177194000	USD
CY2020	us-gaap	Employee Stock Ownership Plan Esop Gain Loss On Transactions In Deferred Shares EmployeeStockOwnershipPlanESOPGainLossOnTransactionsInDeferredShares	1985000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	14702000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6176000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	700151000	USD
CY2020	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><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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 </span></div>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, sales, profits and loss recognition for performance obligations satisfied over time, assumptions associated with pension benefit obligations and income or expenses, useful lives associated with depreciation and amortization of intangible and fixed assets, warranty reserves, sales incentive accruals, assumption associated with stock based compensation valuation, income taxes and tax valuation reserves, environmental reserves, legal reserves, insurance reserves, the valuation of assets and liabilities of discontinued operations, assumptions associated with valuation of acquired assets and assumed liabilities of acquired companies 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.
CY2020Q3	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	8700000	shares
CY2020Q3	us-gaap	Sale Of Stock Consideration Received On Transaction SaleOfStockConsiderationReceivedOnTransaction	178165000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2020	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>
CY2019Q3	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	13100000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	52819000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	51926000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	46733000	USD
CY2020Q3	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	2520000	USD
CY2019Q3	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	2925000	USD
CY2018Q3	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	2896000	USD
CY2020Q3	gff	Original Cost Of Fully Depreciated Property Plant And Equipment OriginalCostOfFullyDepreciatedPropertyPlantAndEquipment	262255000	USD
CY2020	gff	Fair Value Terminal Value FairValueTerminalValue	0.030
CY2019	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-3148000	USD
CY2020	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-1559000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Research And Development Arrangement Contract To Perform For Others Costs Incurred Gross ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross	15400000	USD
CY2020Q3	gff	Cash In Non Us Bank Accounts CashInNonUsBankAccounts	55000000	USD
CY2019Q3	gff	Cash In Non Us Bank Accounts CashInNonUsBankAccounts	34200000	USD
CY2020Q3	gff	Fair Value Of Insurance Contracts FairValueOfInsuranceContracts	3436000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	147145000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	5601000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-8460000	USD
CY2020	gff	Revenue Performance Obligation Satisfied At A Point In Time Percentage RevenuePerformanceObligationSatisfiedAtAPointInTimePercentage	0.86
CY2020	gff	Revenue Performance Obligation Satisfied Over In Time Percentage RevenuePerformanceObligationSatisfiedOverInTimePercentage	0.14
CY2020Q3	gff	Customer Program Reserves And Cash Discounts Netted Against Accounts Receivable CustomerProgramReservesAndCashDiscountsNettedAgainstAccountsReceivable	27607000	USD
CY2019Q3	gff	Customer Program Reserves And Cash Discounts Netted Against Accounts Receivable CustomerProgramReservesAndCashDiscountsNettedAgainstAccountsReceivable	17322000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	7500000	USD
CY2018	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-3649000	USD
CY2020	gff	Revenue Performance Obligation Satisfied At A Point In Time Percentage RevenuePerformanceObligationSatisfiedAtAPointInTimePercentage	0.86
CY2020	gff	Revenue Performance Obligation Satisfied Over In Time Percentage RevenuePerformanceObligationSatisfiedOverInTimePercentage	0.14
CY2020	gff	Contractwith Customer Asset Cumulative Catchup Adjustmentto Revenue ContractwithCustomerAssetCumulativeCatchupAdjustmenttoRevenue	-10650000	USD
CY2019	gff	Contractwith Customer Asset Cumulative Catchup Adjustmentto Revenue ContractwithCustomerAssetCumulativeCatchupAdjustmenttoRevenue	-4500000	USD
CY2018	gff	Contractwith Customer Asset Cumulative Catchup Adjustmentto Revenue ContractwithCustomerAssetCumulativeCatchupAdjustmenttoRevenue	1400000	USD
CY2020Q3	us-gaap	Capitalized Contract Cost Accumulated Impairment CapitalizedContractCostAccumulatedImpairment	10800000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	380000000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.67
CY2020Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Current ContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	84426000	USD
CY2019Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Current ContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	105111000	USD
CY2020	gff	Increase Decrease Contract With Customer Asset And Capitalized Contract Cost Net Current IncreaseDecreaseContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	20685000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	7500000	USD
CY2019Q3	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	13100000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	24386000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	26259000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-1873000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2960000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2020Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	135083000	USD
CY2019Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	121791000	USD
CY2020Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	81624000	USD
CY2019Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	93830000	USD
CY2020Q3	us-gaap	Inventory Finished Goods InventoryFinishedGoods	197118000	USD
CY2019Q3	us-gaap	Inventory Finished Goods InventoryFinishedGoods	226500000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	413825000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	442121000	USD
CY2020Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	815517000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	763542000	USD
CY2020Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	471553000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	426216000	USD
CY2020Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	343964000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	337326000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	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
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	4451000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	1125000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	442643000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	205404000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	75016000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	202682000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	65112000	USD
CY2020Q3	gff	Accrued Marketing And Advertising Current AccruedMarketingAndAdvertisingCurrent	7968000	USD
CY2020Q3	us-gaap	Indefinite Lived Trademarks IndefiniteLivedTrademarks	224640000	USD
CY2019Q3	us-gaap	Indefinite Lived Trademarks IndefiniteLivedTrademarks	219069000	USD
CY2020Q3	gff	Finite Lived And Infinite Lived Intangible Asset Gross FiniteLivedAndInfiniteLivedIntangibleAssetGross	430044000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	75016000	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
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9590000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9922000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9070000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	9443000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	9436000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	9357000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	9331000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	9331000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	83490000	USD
CY2019	gff	Discontinued Operation Claims Dispute Settlement DiscontinuedOperationClaimsDisputeSettlement	11050000	USD
CY2019	gff	Discontinued Operation Claims Dispute Settlement Net Of Tax DiscontinuedOperationClaimsDisputeSettlementNetOfTax	8335000	USD
CY2020Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	83308000	USD
CY2019Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	61639000	USD
CY2020Q3	us-gaap	Interest Payable Current InterestPayableCurrent	4371000	USD
CY2019Q3	us-gaap	Interest Payable Current InterestPayableCurrent	4501000	USD
CY2020Q3	gff	Accrued Warranties And Rebates Current AccruedWarrantiesAndRebatesCurrent	18687000	USD
CY2019Q3	gff	Accrued Warranties And Rebates Current AccruedWarrantiesAndRebatesCurrent	13171000	USD
CY2020Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	10997000	USD
CY2019Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	11996000	USD
CY2020Q3	gff	Accrued Rent Utilities And Freight Current AccruedRentUtilitiesAndFreightCurrent	8816000	USD
CY2019Q3	gff	Accrued Rent Utilities And Freight Current AccruedRentUtilitiesAndFreightCurrent	5326000	USD
CY2020Q3	gff	Accrued Income And Other Taxes Current AccruedIncomeAndOtherTaxesCurrent	14707000	USD
CY2019Q3	gff	Accrued Income And Other Taxes Current AccruedIncomeAndOtherTaxesCurrent	7814000	USD
CY2019Q3	gff	Accrued Marketing And Advertising Current AccruedMarketingAndAdvertisingCurrent	4417000	USD
CY2020Q3	gff	Accrued Restructuring Current AccruedRestructuringCurrent	2965000	USD
CY2019Q3	gff	Accrued Restructuring Current AccruedRestructuringCurrent	0	USD
CY2020Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	19753000	USD
CY2019Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	15801000	USD
CY2020Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	171572000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	124665000	USD
CY2020	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	15789000	USD
CY2020	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	15789000	USD
CY2019Q3	us-gaap	Restructuring Reserve RestructuringReserve	0	USD
CY2020	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	15789000	USD
CY2020	us-gaap	Payments For Restructuring PaymentsForRestructuring	8132000	USD
CY2020	us-gaap	Restructuring Reserve Settled Without Cash2 RestructuringReserveSettledWithoutCash2	4692000	USD
CY2020Q3	us-gaap	Restructuring Reserve RestructuringReserve	2965000	USD
CY2019Q3	gff	Long Term Debt Capitalized Fees And Expenses LongTermDebtCapitalizedFeesAndExpenses	10724000	USD
CY2019Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7894000	USD
CY2018Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8174000	USD
CY2020	gff	Standard And Extended Product Warranty Accrual Increase For Warranties Issued And Increase Decrease For Preexisting Warranties StandardAndExtendedProductWarrantyAccrualIncreaseForWarrantiesIssuedAndIncreaseDecreaseForPreexistingWarranties	20474000	USD
CY2019	gff	Standard And Extended Product Warranty Accrual Increase For Warranties Issued And Increase Decrease For Preexisting Warranties StandardAndExtendedProductWarrantyAccrualIncreaseForWarrantiesIssuedAndIncreaseDecreaseForPreexistingWarranties	16938000	USD
CY2020	us-gaap	Product Warranty Expense ProductWarrantyExpense	17525000	USD
CY2019	us-gaap	Product Warranty Expense ProductWarrantyExpense	17218000	USD
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	10843000	USD
CY2019Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7894000	USD
CY2020Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1064422000	USD
CY2020Q3	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	363000	USD
CY2020Q3	gff	Long Term Debt Capitalized Fees And Expenses LongTermDebtCapitalizedFeesAndExpenses	17821000	USD
CY2020Q3	us-gaap	Long Term Debt LongTermDebt	1046964000	USD
CY2020Q3	gff	Long Term Debt Gross Current LongTermDebtGrossCurrent	9922000	USD
CY2020Q3	us-gaap	Debt Instrument Unamortized Premium Current DebtInstrumentUnamortizedPremiumCurrent	0	USD
CY2020Q3	gff	Debt Issuance Costs Current Net DebtIssuanceCostsCurrentNet	0	USD
CY2020Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	9922000	USD
CY2020Q3	gff	Longterm Debt Gross Noncurrent1 LongtermDebtGrossNoncurrent1	1054500000	USD
CY2020Q3	us-gaap	Debt Instrument Unamortized Premium Noncurrent DebtInstrumentUnamortizedPremiumNoncurrent	363000	USD
CY2020Q3	gff	Debt Issuance Costs Noncurrent Net DebtIssuanceCostsNoncurrentNet	17821000	USD
CY2020Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1037042000	USD
CY2019Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1114131000	USD
CY2019Q3	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	867000	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 Premium Current DebtInstrumentUnamortizedPremiumCurrent	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 Premium Noncurrent DebtInstrumentUnamortizedPremiumNoncurrent	867000	USD
CY2019Q3	gff	Debt Issuance Costs Noncurrent Net DebtIssuanceCostsNoncurrentNet	10724000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1093749000	USD
CY2020	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	128000	USD
CY2020	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	128000	USD
CY2020	us-gaap	Interest Paid InterestPaid	62883000	USD
CY2020	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-122000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3539000	USD
CY2020	us-gaap	Interest Expense Debt InterestExpenseDebt	66544000	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	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
CY2020Q3	gff	Debt Agreements Future Minimum Payments Due Next Twelve Months DebtAgreementsFutureMinimumPaymentsDueNextTwelveMonths	9922000	USD
CY2020Q3	gff	Debt Agreements Future Minimum Payments Due In Two Years DebtAgreementsFutureMinimumPaymentsDueInTwoYears	12667000	USD
CY2020Q3	gff	Debt Agreements Future Minimum Payments Due In Three Years DebtAgreementsFutureMinimumPaymentsDueInThreeYears	16124000	USD
CY2020Q3	gff	Debt Agreements Future Minimum Payments Due In Four Years DebtAgreementsFutureMinimumPaymentsDueInFourYears	1730000	USD
CY2020Q3	gff	Debt Agreements Future Minimum Payments Due In Five Years DebtAgreementsFutureMinimumPaymentsDueInFiveYears	14628000	USD
CY2020Q3	gff	Debt Agreements Future Minimum Payments Due Thereafter DebtAgreementsFutureMinimumPaymentsDueThereafter	1009351000	USD
CY2012Q4	us-gaap	Debt Instrument Basis Spread On Variable Rate1 DebtInstrumentBasisSpreadOnVariableRate1	0.013
CY2020Q3	us-gaap	Line Of Credit LineOfCredit	0	CAD
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	11956000	USD
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
CY2020Q3	us-gaap	Postemployment Benefits Liability Current And Noncurrent PostemploymentBenefitsLiabilityCurrentAndNoncurrent	1833000	USD
CY2019Q3	us-gaap	Postemployment Benefits Liability Current And Noncurrent PostemploymentBenefitsLiabilityCurrentAndNoncurrent	1852000	USD
CY2020	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-1559000	USD
CY2019	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-3148000	USD
CY2018	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-3649000	USD
CY2020	gff	Change In Discount Rate ChangeInDiscountRate	0.10
CY2020	gff	Tax Benefit For Amortization Of Pension Cost TaxBenefitForAmortizationOfPensionCost	878000	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
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-6277000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	15000	USD
CY2020Q1	gff	Adjusted Funding Target Attainment Percent AdjustedFundingTargetAttainmentPercent	0.937
CY2019Q1	gff	Adjusted Funding Target Attainment Percent Threshold AdjustedFundingTargetAttainmentPercentThreshold	0.80
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	2107000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2019Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2020Q3	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1.000
CY2020Q3	gff	Defined Benefit Plan Plan Asset Excluding Accrued Income And Plan Receivables DefinedBenefitPlanPlanAssetExcludingAccruedIncomeAndPlanReceivables	142179000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	147145000	USD
CY2019Q3	gff	Defined Benefit Plan Plan Asset Excluding Accrued Income And Plan Receivables DefinedBenefitPlanPlanAssetExcludingAccruedIncomeAndPlanReceivables	145319000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	145610000	USD
CY2020	gff	Maximum Compensation Of Proportion MaximumCompensationOfProportion	285000	USD
CY2020	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	2878000	USD
CY2019	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	2629000	USD
CY2018	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	9532000	USD
CY2018	gff	Special Dividend Esop Charges SpecialDividendESOPCharges	2588000	USD
CY2020Q3	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	40217000	USD
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	47378000	USD
CY2020Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	3301448	shares
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	3209069	shares
CY2020Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	2058187	shares
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	2259308	shares
CY2020Q3	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	5359635	shares
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	5468377	shares
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.245
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit	-20587000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Income Tax Expense TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsIncomeTaxExpense	12699000	USD
CY2020Q3	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Liability TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability	8344000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	42634000	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
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	40123000	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
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	82757000	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
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	27233000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	28778000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	18188000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2095000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2222000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-17633000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29328000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26556000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	555000	USD
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	10978000	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
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	7331000	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
CY2020	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	11019000	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
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.060
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.066
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29328000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26556000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	555000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
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
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.102
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.033
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.020
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.036
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.001
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
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
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
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	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
CY2020	gff	Effective Income Tax Rate Reconciliation Valuation Allowance EffectiveIncomeTaxRateReconciliationValuationAllowance	-0.015
CY2019	gff	Effective Income Tax Rate Reconciliation Valuation Allowance EffectiveIncomeTaxRateReconciliationValuationAllowance	0.033
CY2018	gff	Effective Income Tax Rate Reconciliation Valuation Allowance EffectiveIncomeTaxRateReconciliationValuationAllowance	0.134
CY2020	gff	Effective Income Tax Rate Reconciliation Nondeductible Nontaxable Items Net EffectiveIncomeTaxRateReconciliationNondeductibleNontaxableItemsNet	0.014
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
CY2020	gff	Effective Income Tax Rate Reconciliation Nondeductible Expense Officer Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent	0.044
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
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.014
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
CY2020	gff	Effective Income Tax Rate Reconciliation Accounting Changesand Other Adjustments Percent EffectiveIncomeTaxRateReconciliationAccountingChangesandOtherAdjustmentsPercent	0
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
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.007
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.004
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.091
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.354
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.368
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.016
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	1918000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	1873000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Warranty Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves	3981000	USD
CY2020Q3	gff	Deferred Tax Assets Bad Debt Reserves DeferredTaxAssetsBadDebtReserves	3980000	USD
CY2019Q3	gff	Deferred Tax Assets Bad Debt Reserves DeferredTaxAssetsBadDebtReserves	1980000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	9371000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	8361000	USD
CY2020Q3	gff	Deferred Tax Assets Deferred Compensation DeferredTaxAssetsDeferredCompensation	18904000	USD
CY2019Q3	gff	Deferred Tax Assets Deferred Compensation DeferredTaxAssetsDeferredCompensation	16544000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	5499000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	5186000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Warranty Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves	2896000	USD
CY2020Q3	gff	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	43045000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	9618000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	11077000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	7031000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	9373000	USD
CY2020Q3	gff	Deferred Tax Assets Capital Loss Carryback DeferredTaxAssetsCapitalLossCarryback	2205000	USD
CY2019Q3	gff	Deferred Tax Assets Capital Loss Carryback DeferredTaxAssetsCapitalLossCarryback	2000000	USD
CY2020Q3	gff	Deferred Tax Assets Interest DeferredTaxAssetsInterest	0	USD
CY2019Q3	gff	Deferred Tax Assets Interest DeferredTaxAssetsInterest	5250000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	6094000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	3738000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	111646000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	68278000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	9824000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	10823000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	101822000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	57455000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	44051000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	42477000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	48172000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	43996000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	41747000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	634000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1096000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	134604000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	87569000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	32782000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	30114000	USD
CY2020Q3	gff	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	43045000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	41747000	USD
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-999000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	32782000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	30114000	USD
CY2020Q3	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	100102000	USD
CY2020Q3	gff	Deferred Tax Assets Valuation Allowance Net Operating Loss Carryforward And Federal Credits Portion DeferredTaxAssetsValuationAllowanceNetOperatingLossCarryforwardAndFederalCreditsPortion	9824000	USD
CY2019Q3	gff	Deferred Tax Assets Valuation Allowance Net Operating Loss Carryforward And Federal Credits Portion DeferredTaxAssetsValuationAllowanceNetOperatingLossCarryforwardAndFederalCreditsPortion	10823000	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
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	125000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	20000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	3000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	23000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4180000	USD
CY2020	gff	Potential Tax Benefits Impact On Effective Tax Rate PotentialTaxBenefitsImpactOnEffectiveTaxRate	909000	USD
CY2020Q3	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	77000	USD
CY2019Q3	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	66000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.30
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
CY2020Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	3535000	USD
CY2020Q3	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	8000000	shares
CY2020Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	21.50
CY2020Q3	us-gaap	Sale Of Stock Consideration Received On Transaction SaleOfStockConsiderationReceivedOnTransaction	163830000	USD
CY2020Q3	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	700000	shares
CY2020Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	21.50
CY2020Q3	us-gaap	Sale Of Stock Consideration Received On Transaction SaleOfStockConsiderationReceivedOnTransaction	14335000	USD
CY2020Q3	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	8700000	shares
CY2020Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	21.50
CY2020Q3	us-gaap	Sale Of Stock Consideration Received On Transaction SaleOfStockConsiderationReceivedOnTransaction	178165000	USD
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
CY2020	us-gaap	Restricted Stock Expense RestrictedStockExpense	14702000	USD
CY2019	us-gaap	Restricted Stock Expense RestrictedStockExpense	13285000	USD
CY2018	us-gaap	Restricted Stock Expense RestrictedStockExpense	10078000	USD
CY2020	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	2878000	USD
CY2019	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	2629000	USD
CY2018	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	9532000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	17580000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	15914000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	19610000	USD
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	17889000	USD
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
CY2020Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	22340000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y3M18D
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	4852762	shares
CY2016Q3	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	50000000	USD
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2020Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	57955000	USD
CY2020	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	340775	shares
CY2020	gff	Shares Paid For Tax Withholding For Share Based Compensation Value SharesPaidForTaxWithholdingForShareBasedCompensationValue	7409000	USD
CY2020	gff	Shares Paid For Tax Withholding For Share Based Compensation Value Per Share SharesPaidForTaxWithholdingForShareBasedCompensationValuePerShare	21.74
CY2018Q2	gff	Common Stock Numberof Shares Heldby Shareholder CommonStockNumberofSharesHeldbyShareholder	5583375	shares
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	38411000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	4282000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	33286000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2695000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	25599000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2375000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	19057000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2119000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	16334000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2074000	USD
CY2020Q3	gff	Lessee Operating Lease Liability Payments Due Year Six LesseeOperatingLeaseLiabilityPaymentsDueYearSix	71903000	USD
CY2020Q3	gff	Finance Lease Liability Payments Due Year Six FinanceLeaseLiabilityPaymentsDueYearSix	9850000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	204590000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	23395000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	36688000	USD
CY2020Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	4704000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	167902000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	18691000	USD
CY2020	gff	Long Term Purchase Commitment Purchases Under Commitment During Period LongTermPurchaseCommitmentPurchasesUnderCommitmentDuringPeriod	239365000	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
CY2020Q3	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	377388000	USD
CY2020Q3	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	9748000	USD
CY2020Q3	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	12000	USD
CY2020Q3	us-gaap	Purchase Obligation Due In Fourth Year PurchaseObligationDueInFourthYear	0	USD
CY2020Q3	us-gaap	Purchase Obligation Due In Fifth Year PurchaseObligationDueInFifthYear	0	USD
CY2009Q2	gff	Net Capital Cost Value In Proposed Remedial Action Plan NetCapitalCostValueInProposedRemedialActionPlan	10000000	USD
CY2020Q3	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	8700000	shares
CY2020Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	21.50
CY2020Q3	us-gaap	Sale Of Stock Consideration Received On Transaction SaleOfStockConsiderationReceivedOnTransaction	178165000	USD
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	56130000	shares
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	46806000	shares
CY2018Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	45675000	shares
CY2020Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	2058000	shares
CY2019Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	2259000	shares
CY2018Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	2477000	shares
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	3556000	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	3420000	shares
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	2522000	shares
CY2020	gff	Weighted Average Number Basic Shares Outstanding Adjustment WeightedAverageNumberBasicSharesOutstandingAdjustment	7928000	shares
CY2019	gff	Weighted Average Number Basic Shares Outstanding Adjustment WeightedAverageNumberBasicSharesOutstandingAdjustment	193000	shares
CY2018	gff	Weighted Average Number Basic Shares Outstanding Adjustment WeightedAverageNumberBasicSharesOutstandingAdjustment	-329000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42588000	shares
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
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2427000	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
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45015000	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
CY2018Q2	gff	Common Stock Numberof Shares Heldby Shareholder CommonStockNumberofSharesHeldbyShareholder	5583375	shares
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	548438000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	149921000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	660673000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.21
CY2019Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	10612000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.26
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.24
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	566350000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	152032000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	895000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.02
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.02
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	632061000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	165003000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	21831000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.52
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.50
CY2020Q3	us-gaap	Gross Profit GrossProfit	174470000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	20091000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.44
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.41
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2407522000	USD
CY2020	us-gaap	Gross Profit GrossProfit	641426000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	53429000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.25
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.19
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	510522000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	139780000	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
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	549633000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	133537000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	6490000	USD
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
CY2019Q2	us-gaap	Gross Profit GrossProfit	151699000	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	158458000	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	583474000	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
CY2019Q4	us-gaap	Restructuring Charges RestructuringCharges	4148000	USD
CY2020Q1	us-gaap	Restructuring Charges RestructuringCharges	3005000	USD
CY2020Q2	us-gaap	Restructuring Charges RestructuringCharges	1224000	USD
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	3488000	USD
CY2020Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2321000	USD
CY2020Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5245000	USD
CY2020Q2	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-969000	USD
CY2020Q3	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-1403000	USD
CY2020Q3	gff	Effective Income Tax Rate Reconciliation Deduction Business Acquistion Costs Amount EffectiveIncomeTaxRateReconciliationDeductionBusinessAcquistionCostsAmount	15000	USD
CY2020Q3	us-gaap	Extinguishment Of Debt Gain Loss Income Tax ExtinguishmentOfDebtGainLossIncomeTax	-24000	USD
CY2019Q3	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1333000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2407522000	USD
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
CY2020	gff	Segment Profit Before Depreciation Amortization Restructuring Fair Value Writeup Of Acquired Inventory Sold And Acquisition Costs SegmentProfitBeforeDepreciationAmortizationRestructuringFairValueWriteupOfAcquiredInventorySoldAndAcquisitionCosts	282912000	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
CY2020	gff	Earnings Before Income Tax Depreciation And Amortization Continuing Operations EarningsBeforeIncomeTaxDepreciationAndAmortizationContinuingOperations	-47013000	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
CY2020	gff	Earnings Loss Before Income Tax Depreciation And Amortization Discontinued Operations EarningsLossBeforeIncomeTaxDepreciationAndAmortizationDiscontinuedOperations	235899000	USD
CY2019	gff	Earnings Loss Before Income Tax Depreciation And Amortization Discontinued Operations EarningsLossBeforeIncomeTaxDepreciationAndAmortizationDiscontinuedOperations	199640000	USD
CY2018	gff	Earnings Loss Before Income Tax Depreciation And Amortization Discontinued Operations EarningsLossBeforeIncomeTaxDepreciationAndAmortizationDiscontinuedOperations	168120000	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-65791000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-67260000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-63871000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	62409000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61848000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	55803000	USD
CY2020	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	15790000	USD
CY2019	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	0	USD
CY2018	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	0	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-7925000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1733000	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
CY2020	us-gaap	Acquisition Costs AcquisitionCosts	2960000	USD
CY2019	us-gaap	Acquisition Costs AcquisitionCosts	0	USD
CY2018	us-gaap	Acquisition Costs AcquisitionCosts	7597000	USD
CY2020	gff	Equity Offering Costs EquityOfferingCosts	0	USD
CY2019	gff	Equity Offering Costs EquityOfferingCosts	0	USD
CY2018	gff	Equity Offering Costs EquityOfferingCosts	1205000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	82757000	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
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	62409000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61848000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	55803000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	48998000	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
CY2020Q3	gff	Assets Of Continuing Operations AssetsOfContinuingOperations	2447520000	USD
CY2019Q3	gff	Assets Of Continuing Operations AssetsOfContinuingOperations	2071730000	USD
CY2020Q3	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	8497000	USD
CY2019Q3	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	3209000	USD
CY2020Q3	us-gaap	Assets Assets	2456017000	USD
CY2019Q3	us-gaap	Assets Assets	2074939000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2407522000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2209289000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2407522000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2209289000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1445000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3127000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4880000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-915000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-438000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-200000	USD
CY2020	us-gaap	Investment Income Net InvestmentIncomeNet	184000	USD
CY2019	us-gaap	Investment Income Net InvestmentIncomeNet	-40000	USD
CY2018	us-gaap	Investment Income Net InvestmentIncomeNet	1184000	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1559000	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
CY2020	gff	Contract Award Income ContractAwardIncome	700000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-9344000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-3168000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6176000	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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	53429000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	37287000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	125678000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6176000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-31804000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	26369000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	47253000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5483000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	152047000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1968000	USD
CY2020	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	671000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	38554000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	7822000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	5606000	USD
CY2020	us-gaap	Lease Cost LeaseCost	51982000	USD
CY2019	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	37068000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	35726000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	48141000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4122000	USD
CY2020	gff	Cash Paid For Lease Liability CashPaidForLeaseLiability	52263000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	161627000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	31848000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	136054000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	167902000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	18774000	USD
CY2020Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3352000	USD
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	15339000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	18691000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	2383000	USD
CY2019Q3	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	6546000	USD
CY2019	us-gaap	Capital Leases Income Statement Amortization Expense CapitalLeasesIncomeStatementAmortizationExpense	3967000	USD
CY2018	us-gaap	Capital Leases Income Statement Amortization Expense CapitalLeasesIncomeStatementAmortizationExpense	3514000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	38411000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	4282000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	33286000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2695000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	25599000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2375000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	19057000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2119000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	16334000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2074000	USD
CY2020Q3	gff	Lessee Operating Lease Liability Payments Due Year Six LesseeOperatingLeaseLiabilityPaymentsDueYearSix	71903000	USD
CY2020Q3	gff	Finance Lease Liability Payments Due Year Six FinanceLeaseLiabilityPaymentsDueYearSix	9850000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	204590000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	23395000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	36688000	USD
CY2020Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	4704000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	167902000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	18691000	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y3M18D
CY2020Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P8Y6M
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0438
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0551
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	218089000	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	348124000	USD
CY2020Q3	gff	Contract With Customer Asset And Capitalized Contract Cost Net Current ContractWithCustomerAssetAndCapitalizedContractCostNetCurrent	84426000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	413825000	USD
CY2020Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	46897000	USD
CY2020Q3	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	2091000	USD
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CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	33810000	USD
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CY2018	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	27558000	USD
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CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	1686000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	13676000	USD
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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 Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2619000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	69758000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	72377000	USD
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CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	50138000	USD
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CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1173000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	22077000	USD
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CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	69758000	USD

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GRIFFON CORP Stock $gff

2020 Q3 Form 10-K Financial Statement

#000005072520000063 Filed on November 13, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GFF GRIFFON CORP Stock $gff

2020 Q3 Form 10-K Financial Statement

#000005072520000063 Filed on November 13, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GFF
GRIFFON CORP Stock $gff