$SMTC
SEMTECH CORP Stock $smtc

$smtc Overview Financials Valuation SEC Filings Company Website

2020 Q1 Form 10-K Financial Statement

#000008894120000003 Filed on March 20, 2020

Income Statement

Concept	2020 Q1	2020	2019 Q1
Revenue	$138.0M	$547.5M	$160.0M
YoY Change	-13.75%	-12.7%	13.79%
Cost Of Revenue	$53.70M	$210.8M	$61.10M
YoY Change	-12.11%	-15.73%	10.69%
Gross Profit	$84.28M	$336.7M	$98.87M
YoY Change	-14.76%	-10.7%	15.77%
Gross Profit Margin	61.07%	61.49%	61.79%
Selling, General & Admin	$51.10M	$163.1M	$30.20M
YoY Change	69.21%	12.3%	-11.18%
% of Gross Profit	60.63%	48.44%	30.55%
Research & Development	$28.00M	$107.4M	$27.60M
YoY Change	1.45%	-1.54%	15.0%
% of Gross Profit	33.22%	31.89%	27.92%
Depreciation & Amortization	$9.300M	$39.58M	$12.30M
YoY Change	-24.39%	-20.26%	-6.82%
% of Gross Profit	11.04%	11.76%	12.44%
Operating Expenses	$82.80M	$284.7M	$64.60M
YoY Change	28.17%	4.84%	-6.65%
Operating Profit	$10.20M	$52.01M	$27.17M
YoY Change	-62.47%	-50.7%	93.93%
Interest Expense	-$1.800M	-$9.106M	-$2.700M
YoY Change	-33.33%	-198.96%	575.0%
% of Operating Profit	-17.65%	-17.51%	-9.94%
Other Income/Expense, Net	$0.00	$2.893M	$1.900M
YoY Change	-100.0%	-24.33%	-34.48%
Pretax Income	-$1.600M	-$24.53M	$33.20M
YoY Change	-104.82%	79.48%	281.61%
Income Tax	$2.800M	$12.83M	$6.600M
% Of Pretax Income			19.88%
Net Earnings	-$4.400M	$31.87M	$13.34M
YoY Change	-132.98%	-54.23%	-1128.53%
Net Earnings / Revenue	-3.19%	5.82%	8.34%
Basic Earnings Per Share	$0.04	$0.48	$0.21
Diluted Earnings Per Share	$0.04	$0.47	$0.20
COMMON SHARES
Basic Shares Outstanding	66.04M shares	66.26M shares	65.53M shares
Diluted Shares Outstanding	67.05M shares	67.42M shares	68.17M shares

Balance Sheet

Concept	2020 Q1	2020	2019 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$293.3M	$293.3M	$312.1M
YoY Change	-6.02%	-6.02%	1.36%
Cash & Equivalents	$293.3M	$293.3M	$312.1M
Short-Term Investments
Other Short-Term Assets	$21.76M	$32.50M	$21.88M
YoY Change	-0.54%	7.26%	26.82%
Inventory	$73.01M	$73.00M	$63.68M
Prepaid Expenses
Receivables	$61.93M	$61.90M	$79.22M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$460.7M	$460.7M	$485.3M
YoY Change	-5.06%	-5.07%	5.22%
LONG-TERM ASSETS
Property, Plant & Equipment	$124.4M	$135.4M	$118.5M
YoY Change	5.0%	14.26%	-4.89%
Goodwill	$351.1M		$351.1M
YoY Change	0.0%		2.7%
Intangibles	$20.01M		$36.56M
YoY Change	-45.26%		-39.28%
Long-Term Investments	$3.300M	$3.300M	$2.700M
YoY Change	22.22%	22.22%	-20.59%
Other Assets	$76.03M	$81.90M	$57.03M
YoY Change	33.32%	19.39%	-39.08%
Total Long-Term Assets	$591.7M	$591.7M	$577.5M
YoY Change	2.46%	2.46%	-7.59%
TOTAL ASSETS
Total Short-Term Assets	$460.7M	$460.7M	$485.3M
Total Long-Term Assets	$591.7M	$591.7M	$577.5M
Total Assets	$1.052B	$1.052B	$1.063B
YoY Change	-0.97%	-0.98%	-2.15%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$48.00M	$48.00M	$43.20M
YoY Change	11.11%	11.11%	16.13%
Accrued Expenses	$50.63M	$38.10M	$68.46M
YoY Change	-26.04%	-27.84%	12.54%
Deferred Revenue	$3.931M		$3.439M
YoY Change	14.31%		-73.04%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$0.00	$18.27M
YoY Change	-100.0%	-100.0%	18.55%
Total Short-Term Liabilities	$98.64M	$98.60M	$129.9M
YoY Change	-24.07%	-24.1%	2.94%
LONG-TERM LIABILITIES
Long-Term Debt	$194.7M	$194.7M	$192.8M
YoY Change	0.98%	0.99%	-8.65%
Other Long-Term Liabilities	$78.25M	$78.20M	$54.08M
YoY Change	44.7%	44.55%	-21.35%
Total Long-Term Liabilities	$273.0M	$272.9M	$246.9M
YoY Change	10.56%	10.53%	-11.77%
TOTAL LIABILITIES
Total Short-Term Liabilities	$98.64M	$98.60M	$129.9M
Total Long-Term Liabilities	$273.0M	$272.9M	$246.9M
Total Liabilities	$371.6M	$375.5M	$376.8M
YoY Change	-1.38%	-1.24%	-7.2%
SHAREHOLDERS EQUITY
Retained Earnings	$611.6M		$579.7M
YoY Change	5.5%		15.82%
Common Stock	$459.4M		$452.7M
YoY Change	1.48%		8.31%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$387.9M		$346.2M
YoY Change	12.03%		37.4%
Treasury Stock Shares	12.38M shares		12.90M shares
Shareholders Equity	$677.0M	$677.0M	$682.6M
YoY Change
Total Liabilities & Shareholders Equity	$1.052B	$1.052B	$1.063B
YoY Change	-0.97%	-0.98%	-2.15%

Cashflow Statement

Concept	2020 Q1	2020	2019 Q1
OPERATING ACTIVITIES
Net Income	-$4.400M	$31.87M	$13.34M
YoY Change	-132.98%	-54.23%	-1128.53%
Depreciation, Depletion And Amortization	$9.300M	$39.58M	$12.30M
YoY Change	-24.39%	-20.26%	-6.82%
Cash From Operating Activities	$45.20M	$118.6M	$47.20M
YoY Change	-4.24%	-35.38%	22.28%
INVESTING ACTIVITIES
Capital Expenditures	-$2.700M	$23.06M	-$4.200M
YoY Change	-35.71%	35.21%	-51.72%
Acquisitions		$0.00
YoY Change		-100.0%
Other Investing Activities	-$2.000M	-$11.30M	-$6.900M
YoY Change	-71.01%	-41.15%	30.19%
Cash From Investing Activities	-$4.600M	-$34.33M	-$11.00M
YoY Change	-58.18%	-5.2%	-21.43%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$70.22M
YoY Change		-39.58%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-30.30M	-$103.1M	-36.20M
YoY Change	-16.3%	-27.99%	364.1%
NET CHANGE
Cash From Operating Activities	45.20M	$118.6M	47.20M
Cash From Investing Activities	-4.600M	-$34.33M	-11.00M
Cash From Financing Activities	-30.30M	-$103.1M	-36.20M
Net Change In Cash	10.30M	-$18.80M	0.000
YoY Change		-547.84%	-100.0%
FREE CASH FLOW
Cash From Operating Activities	$45.20M	$118.6M	$47.20M
Capital Expenditures	-$2.700M	$23.06M	-$4.200M
Free Cash Flow	$47.90M	$95.56M	$51.40M
YoY Change	-6.81%	-42.61%	8.67%

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	--01-26
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000088941
CY2019	smtc	Fair Value Assetsand Liabilities Transfers Between Levels FairValueAssetsandLiabilitiesTransfersBetweenLevels	0	USD
CY2018	smtc	Numberof Weeksin Reporting Period NumberofWeeksinReportingPeriod	52	weeks
CY2019	smtc	Numberof Weeksin Reporting Period NumberofWeeksinReportingPeriod	52	weeks
CY2019Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	774000	USD
CY2020Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	633000	USD
CY2019Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	250000000	shares
CY2020Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	250000000	shares
CY2019Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	78136144	shares
CY2020Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	78136144	shares
CY2019Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	65238255	shares
CY2020Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	65758115	shares
CY2019	us-gaap	Immaterial Error Correction ImmaterialErrorCorrection	Although the Swiss Plan originated in prior years, the Company accounted for the Swiss Plan in accordance with ASC 715-30 Defined Benefit Plans - Pensions starting in 2017. The Company evaluated the impact of not recording the net pension obligation in the Balance Sheets and corresponding charges in net income and total comprehensive income in the Statements of Income and Statements of Comprehensive Income in the historical periods presented, and concluded that the effect was immaterial. The Company corrected the immaterial error in fiscal year 2017 by recording an out of period expense, computed as of February 1, 2016, resulting in a decrease of $1.4 million in net income, an increase in the pension obligation of $5.8 million, an increase in deferred income tax assets of $1.3 million, and a decrease to accumulated other comprehensive income of $3.1 million.
CY2019Q1	us-gaap	Treasury Stock Shares TreasuryStockShares	12897889	shares
CY2020Q1	us-gaap	Treasury Stock Shares TreasuryStockShares	12378029	shares
CY2019Q1	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2020	us-gaap	Valuation Allowance Methodologies And Assumptions ValuationAllowanceMethodologiesAndAssumptions	The valuation allowances established relate to all U. S. and state deferred tax assets, for which we have determined that it is more likely than not that a benefit will not be realized. In considering in whether a valuation allowance was required for our U.S. deferred income tax assets, we considered all available positive and negative evidence. Positive evidence considered included reversing taxable temporary differences. Negative evidence considered included the cumulative taxable losses in the U.S. recorded during the three year period ended January 29, 2018, on both an annual and cumulative basis. Based on the weight of all available evidence, we concluded that the negative evidence outweighed the positive evidence and that it was more likely than not that the U.S. federal and state deferred tax assets that cannot be realized through the reversal of taxable temporary differences would not be realized. As a result, we have established a full valuation allowance against the deferred tax assets in the U.S. that will not be realized through the reversal of taxable temporary differences.
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-01-26
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-06395
CY2020	dei	Entity Registrant Name EntityRegistrantName	SEMTECH CORP
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	95-2119684
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	200 Flynn Road
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Camarillo
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	93012-8790
CY2020	dei	City Area Code CityAreaCode	805
CY2020	dei	Local Phone Number LocalPhoneNumber	498-2111
CY2020	dei	Security12b Title Security12bTitle	Common Stock par value $0.01 per share
CY2020	dei	Trading Symbol TradingSymbol	SMTC
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
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	Entity Shell Company EntityShellCompany	false
CY2019Q3	dei	Entity Public Float EntityPublicFloat	2600000000	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	65795172	shares
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	547512000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	627196000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	587847000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	210828000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	250174000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	235876000	USD
CY2020	us-gaap	Gross Profit GrossProfit	336684000	USD
CY2019	us-gaap	Gross Profit GrossProfit	377022000	USD
CY2018	us-gaap	Gross Profit GrossProfit	351971000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	163106000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	145246000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	148146000	USD
CY2020	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	107368000	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	109047000	USD
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	105070000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	16546000	USD
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CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	27867000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
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CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-2345000	USD
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CY2018	us-gaap	Operating Expenses OperatingExpenses	285350000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	52009000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-7963000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2893000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3823000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	105499000	USD
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CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-9106000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-9202000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3348000	USD
CY2020	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	1211000	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	30000000	USD
CY2018	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	4250000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	44585000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	70120000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	57756000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12828000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	355000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22853000	USD
CY2020	smtc	Net Income Loss Before Equity Method Investments NetIncomeLossBeforeEquityMethodInvestments	31757000	USD
CY2019	smtc	Net Income Loss Before Equity Method Investments NetIncomeLossBeforeEquityMethodInvestments	69765000	USD
CY2018	smtc	Net Income Loss Before Equity Method Investments NetIncomeLossBeforeEquityMethodInvestments	34903000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	109000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-126000	USD
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CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-5000	USD
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CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	31871000	USD
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CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
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CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
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CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66263000	shares
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CY2019	us-gaap	Profit Loss ProfitLoss	69639000	USD
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CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66027000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67418000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68481000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67605000	shares
CY2020	us-gaap	Profit Loss ProfitLoss	31866000	USD
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CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-4991000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2559000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2407000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	94000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	29307000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	67232000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	34743000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-5000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	29312000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	67232000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	34743000	USD
CY2020Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	293324000	USD
CY2019Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	312120000	USD
CY2020Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	61927000	USD
CY2019Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	79223000	USD
CY2020Q1	us-gaap	Inventory Net InventoryNet	73010000	USD
CY2019Q1	us-gaap	Inventory Net InventoryNet	63679000	USD
CY2020Q1	us-gaap	Prepaid Taxes PrepaidTaxes	10718000	USD
CY2019Q1	us-gaap	Prepaid Taxes PrepaidTaxes	8406000	USD
CY2020Q1	us-gaap	Other Assets Current OtherAssetsCurrent	21757000	USD
CY2019Q1	us-gaap	Other Assets Current OtherAssetsCurrent	21876000	USD
CY2020Q1	us-gaap	Assets Current AssetsCurrent	460736000	USD
CY2019Q1	us-gaap	Assets Current AssetsCurrent	485304000	USD
CY2020Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	124418000	USD
CY2019Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	118488000	USD
CY2020Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	20094000	USD
CY2019Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	14261000	USD
CY2020Q1	us-gaap	Goodwill Goodwill	351141000	USD
CY2019Q1	us-gaap	Goodwill Goodwill	351141000	USD
CY2020Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	20012000	USD
CY2019Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	36558000	USD
CY2020Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	76032000	USD
CY2019Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	57028000	USD
CY2020Q1	us-gaap	Assets Assets	1052433000	USD
CY2019Q1	us-gaap	Assets Assets	1062780000	USD
CY2020Q1	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	48009000	USD
CY2019Q1	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	43183000	USD
CY2020Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	50632000	USD
CY2019Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	68462000	USD
CY2020Q1	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2019Q1	us-gaap	Long Term Debt Current LongTermDebtCurrent	18269000	USD
CY2020Q1	us-gaap	Liabilities Current LiabilitiesCurrent	98641000	USD
CY2019Q1	us-gaap	Liabilities Current LiabilitiesCurrent	129914000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3600000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3363000	USD
CY2020Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	194743000	USD
CY2019Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	192845000	USD
CY2020Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	78249000	USD
CY2019Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	54078000	USD
CY2020Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q1	us-gaap	Common Stock Value CommonStockValue	785000	USD
CY2019Q1	us-gaap	Common Stock Value CommonStockValue	785000	USD
CY2020Q1	us-gaap	Treasury Stock Value TreasuryStockValue	387851000	USD
CY2019Q1	us-gaap	Treasury Stock Value TreasuryStockValue	346218000	USD
CY2020Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	458579000	USD
CY2019Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	451884000	USD
CY2020Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	611607000	USD
CY2019Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	579736000	USD
CY2020Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6166000	USD
CY2019Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3607000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	676954000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	682580000	USD
CY2019	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-2242000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	682580000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	31866000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2559000	USD
CY2020	smtc	Noncontrolling Interest Increase From Capital Contribution From Outside Party To Subsidiary NoncontrollingInterestIncreaseFromCapitalContributionFromOutsidePartyToSubsidiary	251000	USD
CY2020Q1	us-gaap	Minority Interest MinorityInterest	246000	USD
CY2019Q1	us-gaap	Minority Interest MinorityInterest	0	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	677200000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	682580000	USD
CY2020Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1052433000	USD
CY2019Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1062780000	USD
CY2017Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	605263000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	34649000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	94000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	47206000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	14849000	USD
CY2018	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-4991000	USD
CY2018Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	665351000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	69639000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2407000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	58921000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	116210000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	50786000	USD
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	70219000	USD
CY2020	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-15505000	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	677200000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	31866000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	69639000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	34649000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	39581000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	49639000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	48999000	USD
CY2020	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	1211000	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	30000000	USD
CY2018	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	4250000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	484000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	528000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	568000	USD
CY2020	smtc	Write Off Of Deferred Financing Cost And Debt Discount WriteOffOfDeferredFinancingCostAndDebtDiscount	514000	USD
CY2019	smtc	Write Off Of Deferred Financing Cost And Debt Discount WriteOffOfDeferredFinancingCostAndDebtDiscount	0	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	5596000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	16047000	USD
CY2018	smtc	Write Off Of Deferred Financing Cost And Debt Discount WriteOffOfDeferredFinancingCostAndDebtDiscount	0	USD
CY2020	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	-5613000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-14894000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	52049000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	66837000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	50051000	USD
CY2020	smtc	Gain Losson Dispositionof Businessand Property Plantand Equipment GainLossonDispositionofBusinessandPropertyPlantandEquipment	-378000	USD
CY2019	smtc	Gain Losson Dispositionof Businessand Property Plantand Equipment GainLossonDispositionofBusinessandPropertyPlantandEquipment	26000	USD
CY2018	smtc	Gain Losson Dispositionof Businessand Property Plantand Equipment GainLossonDispositionofBusinessandPropertyPlantandEquipment	-276000	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-2345000	USD
CY2019	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-9419000	USD
CY2018	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	3892000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	109000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-126000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-254000	USD
CY2020	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	1288000	USD
CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	4275000	USD
CY2019	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	34000	USD
CY2018	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	-1601000	USD
CY2020	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-17296000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	21499000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	1453000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	9331000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-8444000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	5515000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2415000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	587000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	5957000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2603000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	7543000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-5306000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-19532000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	124000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	2448000	USD
CY2020	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-2105000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	408000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-15718000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	3624000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	17052000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	35461000	USD
CY2020	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	11630000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-825000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-12173000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	118616000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	183563000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	111485000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	0	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	0	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	5700000	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	112000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	189000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	23056000	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	9297000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	18665000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	15948000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	17619000	USD
CY2020	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	0	USD
CY2019	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-5967000	USD
CY2018	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-34334000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-36218000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-65856000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	115312000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	15938000	USD
CY2018	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	15000000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	201000000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	101000000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2056000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	237000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	8736000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	21507000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-143148000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-103078000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	18539000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	11671000	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	6002000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	16275000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	6680000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	70219000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	116210000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	14849000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	251000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-34840000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-18796000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	4197000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	10789000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	312120000	USD
CY2018Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	307923000	USD
CY2017Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	297134000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	293324000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	312120000	USD
CY2018Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	307923000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	7906000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	8588000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	6341000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	11157000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	7740000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	31013000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	-2223000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	2024000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	3789000	USD
CY2020	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	0	USD
CY2019	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	500000	USD
CY2018	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	0	USD
CY2020	us-gaap	Fiscal Period FiscalPeriod	<div style="line-height:120%;padding-bottom:6px;padding-top:6px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;text-decoration:underline;">Basis of Presentation</span></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company reports results on the basis of </span><span style="font-family:inherit;font-size:10pt;"><span>52</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>53</span></span><span style="font-family:inherit;font-size:10pt;">-week periods and ends its fiscal year on the last Sunday in January. The fiscal years 2020, 2019 and 2018 </span><span style="font-family:inherit;font-size:10pt;color:#2c2c2c;">each </span><span style="font-family:inherit;font-size:10pt;">consisted of </span><span style="font-family:inherit;font-size:10pt;"><span>52</span></span><span style="font-family:inherit;font-size:10pt;"> weeks.</span></div>
CY2020	smtc	Numberof Weeksin Reporting Period NumberofWeeksinReportingPeriod	52	weeks
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:6px;padding-top:6px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;text-decoration:underline;">Use of Estimates</span></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</span></div>
CY2020Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	19400000	USD
CY2019Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	16700000	USD
CY2020Q1	us-gaap	Equity Method Investments EquityMethodInvestments	3300000	USD
CY2019Q1	us-gaap	Equity Method Investments EquityMethodInvestments	2700000	USD
CY2020	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	1200000	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	30000000.0	USD
CY2018	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	4300000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	900000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	600000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	600000	USD
CY2020	smtc	Acquired Finite Lived Intangible Assets Percentage Of Realizable Undiscounted Cash Flows Used To Determine Useful Life Minimum AcquiredFiniteLivedIntangibleAssetsPercentageOfRealizableUndiscountedCashFlowsUsedToDetermineUsefulLifeMinimum	0.90
CY2020	smtc	Research And Development Recoveries From Engineering Services ResearchAndDevelopmentRecoveriesFromEngineeringServices	8400000	USD
CY2019	smtc	Research And Development Recoveries From Engineering Services ResearchAndDevelopmentRecoveriesFromEngineeringServices	4400000	USD
CY2018	smtc	Research And Development Recoveries From Engineering Services ResearchAndDevelopmentRecoveriesFromEngineeringServices	5400000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	9237000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	1276000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	7961000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	2597000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	116000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	2481000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-637000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	-253000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-384000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	3446000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-476000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	2970000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	3156000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax	650000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	2506000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-2718000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-159000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2559000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-2528000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-121000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2407000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	311000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	217000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	94000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	94000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2407000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2559000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66263000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	65982000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66027000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1155000	shares
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	31871000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	69639000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	34649000	USD
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2499000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1578000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67418000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68481000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67605000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.06
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.02
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	120000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	553000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	402000	shares
CY2020Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10700000	USD
CY2020Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7544000	USD
CY2020Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3156000	USD
CY2019Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3105000	USD
CY2019Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3105000	USD
CY2019Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0	USD
CY2020Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	10200000	USD
CY2020Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	7044000	USD
CY2020Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	500000	USD
CY2020Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	500000	USD
CY2020Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10700000	USD
CY2020Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7544000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-700000	USD
CY2020	smtc	Fair Value Assetsand Liabilities Transfers Between Levels FairValueAssetsandLiabilitiesTransfersBetweenLevels	0	USD
CY2019Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	6675000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	1644000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	2108000	USD
CY2020	us-gaap	Costmethod Investments Other Than Temporary Impairment CostmethodInvestmentsOtherThanTemporaryImpairment	500000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-700000	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	30000000.0	USD
CY2019Q1	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	0	USD
CY2020Q1	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	2223000	USD
CY2019Q1	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	2057000	USD
CY2020Q1	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	50640000	USD
CY2019Q1	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	44530000	USD
CY2020Q1	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	20147000	USD
CY2019Q1	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	17092000	USD
CY2020Q1	us-gaap	Inventory Net InventoryNet	73010000	USD
CY2019Q1	us-gaap	Inventory Net InventoryNet	63679000	USD
CY2020Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	124418000	USD
CY2019Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	118488000	USD
CY2020	us-gaap	Depreciation Depreciation	23400000	USD
CY2019	us-gaap	Depreciation Depreciation	23000000.0	USD
CY2020Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	339205000	USD
CY2019Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	314521000	USD
CY2020Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	214787000	USD
CY2019Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	196033000	USD
CY2018	us-gaap	Depreciation Depreciation	21100000	USD
CY2019Q1	us-gaap	Goodwill Goodwill	351141000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2020Q1	us-gaap	Goodwill Goodwill	351141000	USD
CY2020	us-gaap	Number Of Reporting Units NumberOfReportingUnits	3	reporting_unit
CY2020Q1	smtc	Finite Lived Intangible Assets Excluding Fully Amortized Intangible Assets Gross FiniteLivedIntangibleAssetsExcludingFullyAmortizedIntangibleAssetsGross	88857000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	27867000	USD
CY2020Q1	smtc	Finite Lived Intangible Assets Excluding Fully Amortized Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsExcludingFullyAmortizedIntangibleAssetsAccumulatedAmortization	68845000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	20012000	USD
CY2019Q1	smtc	Finite Lived Intangible Assets Excluding Fully Amortized Intangible Assets Gross FiniteLivedIntangibleAssetsExcludingFullyAmortizedIntangibleAssetsGross	201961000	USD
CY2019Q1	smtc	Finite Lived Intangible Assets Excluding Fully Amortized Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsExcludingFullyAmortizedIntangibleAssetsAccumulatedAmortization	167703000	USD
CY2019Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34258000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	16546000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	26649000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	8266000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4942000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4002000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1676000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1126000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	20012000	USD
CY2020Q1	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	20817000	USD
CY2019Q1	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	34987000	USD
CY2020Q1	smtc	Accrued Sales And Marketing Expenses Current AccruedSalesAndMarketingExpensesCurrent	8581000	USD
CY2019Q1	smtc	Accrued Sales And Marketing Expenses Current AccruedSalesAndMarketingExpensesCurrent	10073000	USD
CY2020Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3273000	USD
CY2019Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	0	USD
CY2020Q1	us-gaap	Deferred Compensation Share Based Arrangements Liability Current DeferredCompensationShareBasedArrangementsLiabilityCurrent	2108000	USD
CY2019Q1	us-gaap	Deferred Compensation Share Based Arrangements Liability Current DeferredCompensationShareBasedArrangementsLiabilityCurrent	3276000	USD
CY2020Q1	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	2449000	USD
CY2019Q1	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	2336000	USD
CY2020Q1	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	3931000	USD
CY2019Q1	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	3439000	USD
CY2020Q1	us-gaap	Deferred Compensation Liability Current DeferredCompensationLiabilityCurrent	1365000	USD
CY2019Q1	us-gaap	Deferred Compensation Liability Current DeferredCompensationLiabilityCurrent	2203000	USD
CY2020Q1	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	0	USD
CY2019Q1	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	2105000	USD
CY2020Q1	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	1450000	USD
CY2019Q1	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	1460000	USD
CY2020Q1	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	6658000	USD
CY2019Q1	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	8583000	USD
CY2020Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	50632000	USD
CY2019Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	68462000	USD
CY2020Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	197000000	USD
CY2019Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	212312000	USD
CY2019Q1	smtc	Longterm Debt Excluding Current Maturities Gross LongtermDebtExcludingCurrentMaturitiesGross	194043000	USD
CY2020Q1	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2019Q1	us-gaap	Long Term Debt Current LongTermDebtCurrent	18269000	USD
CY2020Q1	smtc	Longterm Debt Excluding Current Maturities Gross LongtermDebtExcludingCurrentMaturitiesGross	197000000	USD
CY2020Q1	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2257000	USD
CY2019Q1	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	1198000	USD
CY2020Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	194743000	USD
CY2019Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	192845000	USD
CY2020Q1	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0295
CY2019Q1	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0414
CY2020	smtc	Write Off Of Deferred Financing Cost And Debt Discount WriteOffOfDeferredFinancingCostAndDebtDiscount	500000	USD
CY2020	us-gaap	Interest Expense Debt InterestExpenseDebt	8622000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	8674000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	7395000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	484000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	528000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	568000	USD
CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-9106000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-9202000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-7963000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	52049000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	66837000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	50051000	USD
CY2020	smtc	Increase Decrease In Stock Based Compensation Capitalized Into Inventory IncreaseDecreaseInStockBasedCompensationCapitalizedIntoInventory	0	USD
CY2019	smtc	Increase Decrease In Stock Based Compensation Capitalized Into Inventory IncreaseDecreaseInStockBasedCompensationCapitalizedIntoInventory	0	USD
CY2018	smtc	Increase Decrease In Stock Based Compensation Capitalized Into Inventory IncreaseDecreaseInStockBasedCompensationCapitalizedIntoInventory	-414000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	14.53
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	10.70
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	17031653	shares
CY2019Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	877000	shares
CY2019Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	29.03
CY2019Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	18226000	USD
CY2019Q1	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	472000	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	242000	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	25.22
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	5877000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	11000	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	41.71
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	624000	shares
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	30.26
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	13895000	USD
CY2020Q1	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	428000	shares
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	428000	shares
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	25.26
CY2020Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	11661000	USD
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y1M6D
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	624000	shares
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	30.26
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	13895000	USD
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P2Y8M12D
CY2018Q1	us-gaap	Share Price SharePrice	52.52
CY2020Q1	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	1900000	USD
CY2018Q2	smtc	Sharebased Compensation Arrangementby Sharebased Payment Award Plan Modification Numberof Shares Affected SharebasedCompensationArrangementbySharebasedPaymentAwardPlanModificationNumberofSharesAffected	159000	shares
CY2018Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Number Of Employees Affected ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfEmployeesAffected	8	employee
CY2018Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	2800000	USD
CY2016Q4	us-gaap	Share Based Goods And Nonemployee Services Transaction Shares Approved For Issuance ShareBasedGoodsAndNonemployeeServicesTransactionSharesApprovedForIssuance	1086957	shares
CY2018Q2	smtc	Class Of Warrant Or Right Vested ClassOfWarrantOrRightVested	586956	shares
CY2019	smtc	Classof Warrantor Right Vesting Costs ClassofWarrantorRightVestingCosts	21500000	USD
CY2019	smtc	Classof Warrantor Right Vesting Costs Dueto Acceleration ClassofWarrantorRightVestingCostsDuetoAcceleration	15900000	USD
CY2019Q1	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	869565	shares
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-13667000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-16585000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	69115000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	83787000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-24530000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	74341000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	44585000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	70120000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	57756000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	6463000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-147000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2108000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	100000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	11861000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	21753000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	13442000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	18424000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	21606000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	15550000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	74000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-24928000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	7363000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-33000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-5637000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	3677000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-60000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5596000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-21251000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7303000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12828000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	355000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22853000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	9328000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	14725000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19591000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	68000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-55000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-159000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-966000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	2910000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-8698000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2026000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	3344000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	3278000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-2722000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-23029000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-41911000	USD
CY2020	smtc	Effective Income Tax Rate Reconciliation Nontaxable Gainon Sale EffectiveIncomeTaxRateReconciliationNontaxableGainonSale	-6802000	USD
CY2019	smtc	Effective Income Tax Rate Reconciliation Nontaxable Gainon Sale EffectiveIncomeTaxRateReconciliationNontaxableGainonSale	0	USD
CY2018	smtc	Effective Income Tax Rate Reconciliation Nontaxable Gainon Sale EffectiveIncomeTaxRateReconciliationNontaxableGainonSale	0	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	8636000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	2219000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	1538000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-6008000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	786000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-8040000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	264000	USD
CY2020	smtc	Effective Income Tax Reconciliation Revaluationof Deferred Tax Assetsand Liabilities EffectiveIncomeTaxReconciliationRevaluationofDeferredTaxAssetsandLiabilities	538000	USD
CY2019	smtc	Effective Income Tax Reconciliation Revaluationof Deferred Tax Assetsand Liabilities EffectiveIncomeTaxReconciliationRevaluationofDeferredTaxAssetsandLiabilities	1164000	USD
CY2018	smtc	Effective Income Tax Reconciliation Revaluationof Deferred Tax Assetsand Liabilities EffectiveIncomeTaxReconciliationRevaluationofDeferredTaxAssetsandLiabilities	299000	USD
CY2018	smtc	Effective Income Tax Reconciliation Tax Cutsand Jobs Act Aggregate Impact EffectiveIncomeTaxReconciliationTaxCutsandJobsActAggregateImpact	65442000	USD
CY2020	smtc	Effective Income Tax Reconciliation Tax Cutsand Jobs Act Aggregate Impact EffectiveIncomeTaxReconciliationTaxCutsandJobsActAggregateImpact	0	USD
CY2019	smtc	Effective Income Tax Reconciliation Tax Cutsand Jobs Act Aggregate Impact EffectiveIncomeTaxReconciliationTaxCutsandJobsActAggregateImpact	1904000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-822000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	3075000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-2195000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12828000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	355000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22853000	USD
CY2019	smtc	Effective Income Tax Reconciliation Tax Cuts And Jobs Act Tax Credit General Business Amount EffectiveIncomeTaxReconciliationTaxCutsAndJobsActTaxCreditGeneralBusinessAmount	5000000.0	USD
CY2019	smtc	Effective Income Tax Reconciliation Tax Cuts And Jobs Act Tax Credit Foreign Amount EffectiveIncomeTaxReconciliationTaxCutsAndJobsActTaxCreditForeignAmount	-6900000	USD
CY2018	smtc	Effective Income Tax Reconciliation Tax Cutsand Jobs Act Transition Tax EffectiveIncomeTaxReconciliationTaxCutsandJobsActTransitionTax	66500000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-2600000	USD
CY2020	smtc	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent	0.105
CY2019Q2	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-15800000	USD
CY2020	smtc	Provision Income Tax Charge Tax Cutsand Jobs Act Mandatory Transition Taxon Deemed Repatriationof Foreign Earnings ProvisionIncomeTaxChargeTaxCutsandJobsActMandatoryTransitionTaxonDeemedRepatriationofForeignEarnings	2100000	USD
CY2019	smtc	Tax Cuts And Jobs Act Decrease In Deferred Tax Liability Due To Transition Tax TaxCutsAndJobsActDecreaseInDeferredTaxLiabilityDueToTransitionTax	76500000	USD
CY2020Q1	smtc	Tax Cuts And Jobs Act Measurement Period Adjustment Income Tax Expense Benefit TaxCutsAndJobsActMeasurementPeriodAdjustmentIncomeTaxExpenseBenefit	1900000	USD
CY2020Q1	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	547900000	USD
CY2020	us-gaap	Foreign Earnings Repatriated ForeignEarningsRepatriated	240000000.0	USD
CY2020Q1	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries	76100000	USD
CY2019Q1	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries	80000000.0	USD
CY2020Q1	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	4147000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	4984000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	20000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	17000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	1331000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	2996000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	6063000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	6693000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	7659000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	8773000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	9383000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	8133000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5607000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	14047000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	2070000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	832000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	746000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	763000	USD
CY2020Q1	us-gaap	Deferred Tax Assets In Process Research And Development DeferredTaxAssetsInProcessResearchAndDevelopment	2864000	USD
CY2019Q1	us-gaap	Deferred Tax Assets In Process Research And Development DeferredTaxAssetsInProcessResearchAndDevelopment	0	USD
CY2020Q1	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	2875000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	0	USD
CY2020Q1	smtc	Deferred Tax Assets Leasing Deferred Assets DeferredTaxAssetsLeasingDeferredAssets	2396000	USD
CY2019Q1	smtc	Deferred Tax Assets Leasing Deferred Assets DeferredTaxAssetsLeasingDeferredAssets	0	USD
CY2020Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	1713000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	1031000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Valuation Allowance Noncurrent DeferredTaxAssetsValuationAllowanceNoncurrent	16189000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Valuation Allowance Noncurrent DeferredTaxAssetsValuationAllowanceNoncurrent	18912000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Gross Noncurrent DeferredTaxAssetsGrossNoncurrent	30685000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Gross Noncurrent DeferredTaxAssetsGrossNoncurrent	29357000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	0	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	3227000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	6034000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	6482000	USD
CY2020Q1	smtc	Deferred Tax Liabilities Repatriationof Foreign Earnings DeferredTaxLiabilitiesRepatriationofForeignEarnings	4323000	USD
CY2019Q1	smtc	Deferred Tax Liabilities Repatriationof Foreign Earnings DeferredTaxLiabilitiesRepatriationofForeignEarnings	8158000	USD
CY2020Q1	smtc	Deferred Tax Liabilities Leasing Deferred Liabilities DeferredTaxLiabilitiesLeasingDeferredLiabilities	2285000	USD
CY2019Q1	smtc	Deferred Tax Liabilities Leasing Deferred Liabilities DeferredTaxLiabilitiesLeasingDeferredLiabilities	0	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1549000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	592000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	14191000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	18459000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	16494000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	10898000	USD
CY2020Q1	smtc	Deferred Tax Assets Netof Deferred Tax Liabilities Before Valuation Allowance DeferredTaxAssetsNetofDeferredTaxLiabilitiesBeforeValuationAllowance	32700000	USD
CY2019Q1	smtc	Deferred Tax Assets Netof Deferred Tax Liabilities Before Valuation Allowance DeferredTaxAssetsNetofDeferredTaxLiabilitiesBeforeValuationAllowance	29800000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	16200000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	18900000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	18912000	USD
CY2018Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	41050000	USD
CY2017Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	82961000	USD
CY2018	smtc	Valuation Allowance Releases ValuationAllowanceReleases	41985000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	16189000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	18912000	USD
CY2018Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	41050000	USD
CY2020	smtc	Percentageofuncertaintaxpositionsevaluatingcriteria Percentageofuncertaintaxpositionsevaluatingcriteria	0.50
CY2020	smtc	Valuation Allowance Additions ValuationAllowanceAdditions	159000	USD
CY2019	smtc	Valuation Allowance Additions ValuationAllowanceAdditions	152000	USD
CY2018	smtc	Valuation Allowance Additions ValuationAllowanceAdditions	74000	USD
CY2020	smtc	Valuation Allowance Releases ValuationAllowanceReleases	2882000	USD
CY2019	smtc	Valuation Allowance Releases ValuationAllowanceReleases	22290000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18293000	USD
CY2018Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	16059000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2252000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2642000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	6850000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	399000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1530000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	408000	USD
CY2020Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	25466000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18293000	USD
CY2020Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8600000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4500000	USD
CY2020Q1	smtc	Liability For Uncertain Tax Positions Current And Noncurrent LiabilityForUncertainTaxPositionsCurrentAndNoncurrent	24130000	USD
CY2019Q1	smtc	Liability For Uncertain Tax Positions Current And Noncurrent LiabilityForUncertainTaxPositionsCurrentAndNoncurrent	16971000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0	USD
CY2020Q1	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P3Y
CY2020Q1	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	300000	USD
CY2020	smtc	Lessee Operating Lease Termination Period LesseeOperatingLeaseTerminationPeriod	P1Y
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	4820000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	372000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	130000	USD
CY2020	us-gaap	Lease Cost LeaseCost	5062000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	5189000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3366000	USD
CY2020	smtc	Right Of Use Asset Write Down RightOfUseAssetWriteDown	1363000	USD
CY2020Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y8M15D
CY2020Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.068
CY2020Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10958000	USD
CY2020Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3273000	USD
CY2020Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	8185000	USD
CY2020Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	11458000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3945000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2791000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1776000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1524000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1374000	USD
CY2020Q1	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	49837000	USD
CY2020Q1	us-gaap	Purchase Obligation Due In Second And Third Year PurchaseObligationDueInSecondAndThirdYear	5856000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	2164000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	13574000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2116000	USD
CY2020Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	11458000	USD
CY2020	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	6500000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	6300000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5900000	USD
CY2020	us-gaap	Operating Leases Income Statement Sublease Revenue OperatingLeasesIncomeStatementSubleaseRevenue	130000	USD
CY2019	us-gaap	Operating Leases Income Statement Sublease Revenue OperatingLeasesIncomeStatementSubleaseRevenue	138000	USD
CY2018	us-gaap	Operating Leases Income Statement Sublease Revenue OperatingLeasesIncomeStatementSubleaseRevenue	141000	USD
CY2020Q1	us-gaap	Purchase Obligation PurchaseObligation	55693000	USD
CY2018Q3	us-gaap	Litigation Settlement Amount Awarded From Other Party LitigationSettlementAmountAwardedFromOtherParty	9000000.0	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	2400000	USD
CY2020	smtc	Deferred Compensation Income Expense Including Forfeitures DeferredCompensationIncomeExpenseIncludingForfeitures	6800000	USD
CY2019	smtc	Deferred Compensation Income Expense Including Forfeitures DeferredCompensationIncomeExpenseIncludingForfeitures	1300000	USD
CY2018	smtc	Deferred Compensation Income Expense Including Forfeitures DeferredCompensationIncomeExpenseIncludingForfeitures	6000000.0	USD
CY2020Q1	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	2108000	USD
CY2019Q1	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	6675000	USD
CY2020Q1	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	2108000	USD
CY2020	smtc	Numberof Operating Segmentsthat Aggregateinto One Reportable Segment NumberofOperatingSegmentsthatAggregateintoOneReportableSegment	3	segment
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	627196000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	587847000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	547512000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	627196000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	587847000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	547512000	USD
CY2020Q1	us-gaap	Noncurrent Assets NoncurrentAssets	124418000	USD
CY2019Q1	us-gaap	Noncurrent Assets NoncurrentAssets	118488000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	547512000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	627196000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	587847000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	547512000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	627196000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	587847000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	700000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	6300000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	2200000	USD
CY2017Q1	us-gaap	Restructuring Reserve RestructuringReserve	13000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	6301000	USD
CY2018	us-gaap	Payments For Restructuring PaymentsForRestructuring	1565000	USD
CY2018Q1	us-gaap	Restructuring Reserve RestructuringReserve	4749000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	695000	USD
CY2019	us-gaap	Payments For Restructuring PaymentsForRestructuring	4435000	USD
CY2019Q1	us-gaap	Restructuring Reserve RestructuringReserve	1009000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	2166000	USD
CY2020	us-gaap	Payments For Restructuring PaymentsForRestructuring	2937000	USD
CY2020Q1	us-gaap	Restructuring Reserve RestructuringReserve	238000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	337800000	USD
CY2020Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	110600000	USD
CY2020	us-gaap	Objectives For Using Derivative Instruments ObjectivesForUsingDerivativeInstruments	The Company is exposed to certain risk arising from both its business operations and economic conditions and principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company, on a routine basis and in the normal course of business, experiences expenses denominated in Swiss Franc ("CHF"), Canadian Dollar ("CAD") and Great British Pound ("GBP"). Such expenses expose the Company to exchange rate fluctuations between these foreign currencies and the U.S. Dollar ("USD"). From time to time, the Company uses derivative financial instruments in the form of forward contracts to mitigate risk associated with adverse movements in these foreign currency exchange rates on a portion of foreign denominated expenses expected to be realized during the current and following fiscal year.
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	145246000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	148146000	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	109047000	USD
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	105070000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	271523000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	285350000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	105499000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	66621000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	70120000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	57756000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	355000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22853000	USD
CY2019	smtc	Net Income Loss Before Equity Method Investments NetIncomeLossBeforeEquityMethodInvestments	69765000	USD
CY2018	smtc	Net Income Loss Before Equity Method Investments NetIncomeLossBeforeEquityMethodInvestments	34903000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	69639000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	34649000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.06
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.02
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	67232000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	34743000	USD
CY2019Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	14261000	USD
CY2018Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	4574000	USD
CY2019Q1	us-gaap	Assets Assets	1062780000	USD
CY2018Q1	us-gaap	Assets Assets	1086114000	USD
CY2019Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	451884000	USD
CY2018Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	417171000	USD
CY2019Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	579736000	USD
CY2018Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	500569000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	682580000	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	665351000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	682580000	USD
CY2018Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	665351000	USD
CY2019Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1062780000	USD
CY2018Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1086114000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	138001000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	141011000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	137146000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	131354000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	84277000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	86248000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	84884000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	81275000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	10196000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	17877000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	11769000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	12167000	USD
CY2020Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2934000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	13997000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2192000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	12748000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.04
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.03
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.04
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66041000	shares
CY2019Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66387000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66519000	shares
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-1673000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	13843000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	14787000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	98867000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	106562000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	100124000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	71469000	USD
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66105000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67051000	shares
CY2019Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67318000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67746000	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67976000	shares
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	160006000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	173550000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	163211000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	27260000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	13749000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	130429000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	27167000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	44784000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	35221000	USD
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	65525000	shares
CY2018Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66014000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66063000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66324000	shares
CY2019Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68165000	shares
CY2018Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68731000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68880000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68195000	shares

Files In Submission

Name	View Source	Status
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$SMTC
SEMTECH CORP Stock $smtc

2020 Q1 Form 10-K Financial Statement

#000008894120000003 Filed on March 20, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SMTC SEMTECH CORP Stock $smtc

2020 Q1 Form 10-K Financial Statement

#000008894120000003 Filed on March 20, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SMTC
SEMTECH CORP Stock $smtc