$COHU
COHU INC Stock $cohu

$cohu Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000143774921024650 Filed on October 29, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue	$191.9M	$225.1M	$150.6M
YoY Change	-5.19%	49.4%	4.98%
Cost Of Revenue	$107.5M	$129.4M	$87.15M
YoY Change	-3.28%	48.44%	3.05%
Gross Profit	$84.39M	$95.71M	$63.50M
YoY Change	-7.5%	50.72%	7.75%
Gross Profit Margin	43.99%	42.52%	42.15%
Selling, General & Admin	$31.12M	$30.38M	$31.34M
YoY Change	-7.37%	-3.06%	-6.99%
% of Gross Profit	36.88%	31.74%	49.35%
Research & Development	$22.60M	$22.79M	$20.50M
YoY Change	-0.89%	11.2%	0.07%
% of Gross Profit	26.77%	23.81%	32.28%
Depreciation & Amortization	$11.47M	$12.10M	$13.24M
YoY Change	-14.88%	-8.57%	-12.95%
% of Gross Profit	13.59%	12.65%	20.85%
Operating Expenses	$61.97M	$53.17M	$51.83M
YoY Change	-6.54%	2.58%	-4.32%
Operating Profit	$22.43M	$33.72M	-$1.360M
YoY Change	-10.07%	-2579.12%	-77.42%
Interest Expense	-$273.0K	$966.0K	$3.021M
YoY Change	-92.2%	-68.02%	-39.58%
% of Operating Profit	-1.22%	2.87%
Other Income/Expense, Net
YoY Change
Pretax Income	$17.28M	$31.13M	-$5.530M
YoY Change	12.95%	-662.84%	-39.91%
Income Tax	-$3.607M	$7.392M	$1.116M
% Of Pretax Income	-20.87%	23.75%
Net Earnings	$20.89M	$23.73M	-$6.646M
YoY Change	40.56%	-457.1%	-36.51%
Net Earnings / Revenue	10.89%	10.55%	-4.41%
Basic Earnings Per Share		$0.49	-$0.16
Diluted Earnings Per Share	$422.6K	$0.48	-$0.16
COMMON SHARES
Basic Shares Outstanding	48.69M	48.67M	41.95M
Diluted Shares Outstanding		49.46M	41.95M

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$379.9M	$364.8M	$170.9M
YoY Change	123.47%	113.46%	17.3%
Cash & Equivalents	$290.2M	$288.8M	$169.9M
Short-Term Investments	$89.70M	$76.02M	$900.0K
Other Short-Term Assets	$768.0K	$1.774M	$1.273M
YoY Change	-57.96%	39.36%	-52.3%
Inventory	$161.1M	$157.5M	$137.9M
Prepaid Expenses	$16.19M	$18.92M	$17.99M
Receivables	$192.9M	$200.5M	$116.8M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$750.8M	$743.5M	$444.8M
YoY Change	54.79%	67.15%	3.06%
LONG-TERM ASSETS
Property, Plant & Equipment	$63.96M	$65.16M	$64.55M
YoY Change	-4.42%	0.95%	-8.37%
Goodwill	$219.8M	$223.7M	$244.3M
YoY Change	-12.89%	-8.45%	3.58%
Intangibles	$177.3M	$193.1M	$238.8M
YoY Change	-24.12%	-19.16%	-15.45%
Long-Term Investments
YoY Change
Other Assets	$22.12M	$21.18M	$23.72M
YoY Change	-4.61%	-10.7%	39.86%
Total Long-Term Assets	$508.3M	$529.4M	$601.5M
YoY Change	-16.03%	-12.0%	-6.01%
TOTAL ASSETS
Total Short-Term Assets	$750.8M	$743.5M	$444.8M
Total Long-Term Assets	$508.3M	$529.4M	$601.5M
Total Assets	$1.259B	$1.273B	$1.046B
YoY Change	15.47%	21.65%	-2.36%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$85.23M	$86.58M	$49.37M
YoY Change	25.48%	75.37%	2.58%
Accrued Expenses	$65.28M	$68.80M	$61.40M
YoY Change	-8.05%	12.05%	-9.04%
Deferred Revenue	$7.300M	$8.027M	$11.12M
YoY Change	-49.34%	-27.79%	-31.38%
Short-Term Debt	$3.059M	$3.160M	$5.200M
YoY Change	-42.28%	-39.23%	62.5%
Long-Term Debt Due	$14.40M	$7.449M	$8.199M
YoY Change	71.62%	-9.15%	28.47%
Total Short-Term Liabilities	$192.5M	$202.2M	$146.9M
YoY Change	10.32%	37.61%	5.42%
LONG-TERM LIABILITIES
Long-Term Debt	$103.4M	$110.9M	$331.5M
YoY Change	-66.81%	-66.55%	-3.9%
Other Long-Term Liabilities	$54.74M	$59.40M	$64.30M
YoY Change	-13.11%	-7.62%	-2.72%
Total Long-Term Liabilities	$103.4M	$110.9M	$331.5M
YoY Change	-66.81%	-66.55%	-3.9%
TOTAL LIABILITIES
Total Short-Term Liabilities	$192.5M	$202.2M	$146.9M
Total Long-Term Liabilities	$103.4M	$110.9M	$331.5M
Total Liabilities	$295.9M	$313.0M	$478.4M
YoY Change	-39.13%	-34.56%	-1.22%
SHAREHOLDERS EQUITY
Retained Earnings	$193.6M	$172.7M	$11.37M
YoY Change	637.91%	1418.74%	-81.76%
Common Stock	$723.5M	$718.7M	$484.6M
YoY Change	47.54%	48.31%	3.18%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$7.324M
YoY Change
Treasury Stock Shares	$207.0K
Shareholders Equity	$882.5M	$872.0M	$474.6M
YoY Change
Total Liabilities & Shareholders Equity	$1.259B	$1.273B	$1.046B
YoY Change	15.47%	21.65%	-2.36%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	$20.89M	$23.73M	-$6.646M
YoY Change	40.56%	-457.1%	-36.51%
Depreciation, Depletion And Amortization	$11.47M	$12.10M	$13.24M
YoY Change	-14.88%	-8.57%	-12.95%
Cash From Operating Activities	$27.77M	$34.25M	$14.73M
YoY Change	27.9%	132.51%	79.42%
INVESTING ACTIVITIES
Capital Expenditures	-$3.076M	-$3.375M	-$5.600M
YoY Change	-39.69%	-39.73%	13.13%
Acquisitions
YoY Change
Other Investing Activities	-$13.75M	$4.910M	$14.46M
YoY Change	-30.07%	-66.04%	1936.62%
Cash From Investing Activities	-$16.82M	$1.535M	$8.860M
YoY Change	-32.05%	-82.67%	-308.96%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-5.999M	-100.7M	-16.98M
YoY Change	-67.59%	493.06%	-11420.0%
NET CHANGE
Cash From Operating Activities	27.77M	34.25M	14.73M
Cash From Investing Activities	-16.82M	1.535M	8.860M
Cash From Financing Activities	-5.999M	-100.7M	-16.98M
Net Change In Cash	4.945M	-64.92M	6.610M
YoY Change	-122.94%	-1082.12%	60.44%
FREE CASH FLOW
Cash From Operating Activities	$27.77M	$34.25M	$14.73M
Capital Expenditures	-$3.076M	-$3.375M	-$5.600M
Free Cash Flow	$30.84M	$37.62M	$20.33M
YoY Change	15.05%	85.07%	54.48%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000
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CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	42190000
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.06
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	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	0	USD
	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	0	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	100000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	100000	USD
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CY2020Q3	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	7447000	USD
	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	21133000	USD
	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	21969000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	288785000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	149358000	USD
CY2021Q3	us-gaap	Short Term Investments ShortTermInvestments	76020000	USD
CY2020Q4	us-gaap	Short Term Investments ShortTermInvestments	20669000	USD
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CY2021Q3	us-gaap	Inventory Net InventoryNet	157512000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	142500000	USD
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CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	18773000	USD
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CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	34862000	USD
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	us-gaap	Costs And Expenses CostsAndExpenses	511391000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	449166000	USD
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	us-gaap	Operating Income Loss OperatingIncomeLoss	183963000	USD
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CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	31125000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-5530000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	175062000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-28443000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7392000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1116000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28626000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	261000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	23733000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-6646000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	146436000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-28704000	USD
CY2021Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	42000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	23733000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-6646000	USD
	us-gaap	Net Income Loss NetIncomeLoss	146436000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-28662000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.49
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.16
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.12
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.69
CY2021Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.49
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.16
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.12
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.69
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.48
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.16
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.04
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.69
CY2021Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.16
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.04
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.69
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48666000
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41947000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46992000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41764000
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49457000
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41947000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48137000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41764000
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.06
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	23733000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-6646000	USD
	us-gaap	Net Income Loss NetIncomeLoss	146436000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-28662000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-5206000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	11692000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-12562000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	12660000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-44000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-0	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-15000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-0	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-11000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-25000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-0	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	2515000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-0	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5173000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	11692000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-15087000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12660000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	18560000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5046000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	131349000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-16002000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	850231000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	23733000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-5206000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-44000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-11000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	351000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2021Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	877000	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3714000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	871979000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	512288000	USD
	us-gaap	Net Income Loss NetIncomeLoss	146436000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-12562000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-15000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-25000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2510000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1749000	USD
	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	10407000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	2515000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11371000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	223119000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	871979000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	466758000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-6646000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	11692000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	86000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2020Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	580000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3299000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	474609000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	483072000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-28662000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	12660000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2486000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	375000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1602000	USD
	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	2265000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10313000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	474609000	USD
	us-gaap	Net Income Loss NetIncomeLoss	146436000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-28662000	USD
	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	75754000	USD
	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	35000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3411000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	293000	USD
	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	11249000	USD
	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	54000	USD
	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	4328000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	37102000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	39283000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	10743000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	10313000	USD
	cohu	Amortization Of Inventory Stepup And Inventory Related Charges AmortizationOfInventoryStepupAndInventoryRelatedCharges	2330000	USD
	cohu	Amortization Of Inventory Stepup And Inventory Related Charges AmortizationOfInventoryStepupAndInventoryRelatedCharges	4281000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3801000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5194000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-409000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	757000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	49000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-601000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	941000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-144000	USD
	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	1157000	USD
	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	830000	USD
	cohu	Interest Capitalized Associated With Cloud Computing Implementation InterestCapitalizedAssociatedWithCloudComputingImplementation	133000	USD
	cohu	Interest Capitalized Associated With Cloud Computing Implementation InterestCapitalizedAssociatedWithCloudComputingImplementation	95000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	542000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	892000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-3402000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-988000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	634000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	1635000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	65538000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-13028000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	27531000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	11399000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	1932000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-2241000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	18284000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-3475000	USD
	cohu	Increase Decrease In Deferred Profit IncreaseDecreaseInDeferredProfit	2751000	USD
	cohu	Increase Decrease In Deferred Profit IncreaseDecreaseInDeferredProfit	4170000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	16188000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-1245000	USD
	cohu	Increase Decrease In Accrued Compensation Warranty And Other Liabilities IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities	3107000	USD
	cohu	Increase Decrease In Accrued Compensation Warranty And Other Liabilities IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities	-2631000	USD
	cohu	Increase Decrease In Operating Lease Right Of Use Assets IncreaseDecreaseInOperatingLeaseRightOfUseAssets	-5339000	USD
	cohu	Increase Decrease In Operating Lease Right Of Use Assets IncreaseDecreaseInOperatingLeaseRightOfUseAssets	-5237000	USD
	cohu	Increase Decrease In Current And Noncurrent Operating Lease Liabilities IncreaseDecreaseInCurrentAndNoncurrentOperatingLeaseLiabilities	-5585000	USD
	cohu	Increase Decrease In Current And Noncurrent Operating Lease Liabilities IncreaseDecreaseInCurrentAndNoncurrentOperatingLeaseLiabilities	-5459000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	69961000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	28020000	USD
	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	120886000	USD
	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	2975000	USD
	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	106000	USD
	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	16982000	USD
	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	168918000	USD
	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	-0	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	113567000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	0	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8924000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13559000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	56717000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	6398000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	-0	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	4971000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5808000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	220000	USD
	us-gaap	Proceeds From Construction Loans Payable ProceedsFromConstructionLoansPayable	1279000	USD
	us-gaap	Proceeds From Construction Loans Payable ProceedsFromConstructionLoansPayable	5878000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	223119000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	205879000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	20246000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	12711000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-19559000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	38000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-863000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	139427000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	13996000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	149358000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	155930000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	288785000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	169926000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	6067000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5122000	USD
	cohu	Inventory Capitalized As Property Plant And Equipment InventoryCapitalizedAsPropertyPlantAndEquipment	1511000	USD
	cohu	Inventory Capitalized As Property Plant And Equipment InventoryCapitalizedAsPropertyPlantAndEquipment	827000	USD
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin: 0pt 0pt 0pt 27pt; text-align: justify;"><b>Concentration of Credit Risk</b></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 28pt;">Financial instruments that potentially subject us to significant credit risk consist principally of cash equivalents, short-term investments and trade accounts receivable. We invest in a variety of financial instruments and, by policy, limit the amount of credit exposure with any <em style="font: inherit;">one</em> issuer.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 28pt;">Our trade accounts receivable are presented net of an allowance for credit losses, which is determined in accordance with the guidance provided by Accounting Standards Update (“ASU”) <em style="font: inherit;">2016</em>-<em style="font: inherit;">13,</em> <i>Financial Instruments-Credit Losses (Topic <em style="font: inherit;">326</em>): Measurement of Credit Losses on Financial Instruments</i>. At <em style="font: inherit;"> September 25, 2021 </em>and <em style="font: inherit;"> December 26, 2020 </em>our allowance for credit losses was $0.4 million and $0.1 million, respectively. Our customers include semiconductor manufacturers and semiconductor test subcontractors throughout many areas of the world. While we believe that our allowance for credit losses is adequate and represents our best estimate at <em style="font: inherit;"> September 25, 2021, </em>we will continue to monitor customer liquidity and other economic conditions, including the impact of the COVID-<em style="font: inherit;">19</em> pandemic, which <em style="font: inherit;"> may </em>result in changes to our estimates regarding expected credit losses.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
	cohu	Capitalized Cloud Computing Service Costs But Not Yet Paid CapitalizedCloudComputingServiceCostsButNotYetPaid	1182000	USD
	cohu	Capitalized Cloud Computing Service Costs But Not Yet Paid CapitalizedCloudComputingServiceCostsButNotYetPaid	1923000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	400000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	100000	USD
	us-gaap	Interest Paid Net InterestPaidNet	5381000	USD
	us-gaap	Interest Paid Net InterestPaidNet	13615000	USD
CY2021Q3	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	91935000	USD
CY2020Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	83755000	USD
CY2021Q3	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	44952000	USD
CY2020Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	44315000	USD
CY2021Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	20625000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	14430000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	157512000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	142500000	USD
CY2021Q3	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	pure
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	pure
CY2021Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	113440000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	114636000	USD
CY2021Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	48282000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	47720000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	65158000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	66916000	USD
CY2021Q3	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	13300000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	13500000	USD
CY2021Q3	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	400000	USD
	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	1200000	USD
CY2020Q3	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	300000	USD
	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	800000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	pure
CY2020Q4	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2021Q3	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	100000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	500000	USD
CY2020Q3	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	300000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	900000	USD
CY2021Q3	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-28000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-300000	USD
CY2020Q3	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-1500000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-2500000	USD
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3714000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3299000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10743000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10313000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	155000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	215000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	569000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	610000	USD
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3559000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3084000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	10174000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	9703000	USD
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	239000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	160000
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	109000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	151000
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48666000
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41947000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46992000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41764000
CY2020Q4	us-gaap	Deferred Revenue DeferredRevenue	17100000	USD
CY2021Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	791000
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1145000
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49457000
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41947000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48137000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41764000
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	7800000	USD
CY2021Q3	us-gaap	Deferred Revenue DeferredRevenue	20100000	USD
CY2021Q3	cohu	Deferred Profit DeferredProfit	11300000	USD
CY2021Q3	cohu	Deferred Profit Longterm DeferredProfitLongterm	6200000	USD
CY2020Q4	cohu	Deferred Profit DeferredProfit	8700000	USD
CY2020Q4	cohu	Deferred Profit Longterm DeferredProfitLongterm	6700000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	225063000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	150647000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	695354000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	433652000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	225063000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	150647000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	695354000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	433652000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-19400000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4300000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	134435000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	338279000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	112412000	USD
	cohu	Transfer From In Process Technology To Developed Technology TransferFromInProcessTechnologyToDevelopedTechnology	5600000	USD
CY2020Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	8900000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	27200000	USD
CY2021Q3	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	1615000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	5568000	USD
CY2021Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	7449000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	8389000	USD
CY2021Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	110887000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	311551000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	238669000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	13635000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	252304000	USD
	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	21899000	USD
	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-6722000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	223683000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9800000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	28800000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	325601000	USD
CY2021Q3	us-gaap	Line Of Credit LineOfCredit	3160000	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	5314000	USD
CY2021Q3	cohu	Debt Longterm And Shortterm Combined Amount Gross DebtLongtermAndShorttermCombinedAmountGross	119951000	USD
CY2020Q4	cohu	Debt Longterm And Shortterm Combined Amount Gross DebtLongtermAndShorttermCombinedAmountGross	325508000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	76012000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	11000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	3000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	76020000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	20668000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	20669000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	21300000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	8700000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	73545000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	73553000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	20668000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	20669000	USD
CY2021Q3	cohu	Availableforsale Securities Debt Maturities Year Two Through Three Amortized Cost Basis AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis	2467000	USD
CY2021Q3	cohu	Available For Sale Securities Debt Maturities Due After One Year Through Three Years Estimated Fair Value AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearThroughThreeYearsEstimatedFairValue	2467000	USD
CY2020Q4	cohu	Availableforsale Securities Debt Maturities Year Two Through Three Amortized Cost Basis AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis	0	USD
CY2020Q4	cohu	Available For Sale Securities Debt Maturities Due After One Year Through Three Years Estimated Fair Value AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearThroughThreeYearsEstimatedFairValue	0	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	76012000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	76020000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	20668000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	20669000	USD
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	250193
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	12442
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	9.44
CY2021Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	300000	USD
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y6M
CY2021Q3	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	90000	USD
CY2020Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	42000	USD
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	197000	USD
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	210000	USD
CY2021Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1650000	USD
CY2020Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	293000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3411000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	293000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	31125000	USD
CY2021Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.237	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.164	pure
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.202	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.009	pure
CY2021Q3	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	0	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	0	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	225063000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	150647000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	695354000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	433652000	USD
CY2021Q3	cohu	Profit Loss From Operating Segment ProfitLossFromOperatingSegment	36345000	USD
CY2020Q3	cohu	Profit Loss From Operating Segment ProfitLossFromOperatingSegment	-2384000	USD
	cohu	Profit Loss From Operating Segment ProfitLossFromOperatingSegment	117480000	USD
	cohu	Profit Loss From Operating Segment ProfitLossFromOperatingSegment	-13283000	USD
CY2020Q3	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	75754000	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2021Q3	us-gaap	Interest Expense InterestExpense	966000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	3021000	USD
	us-gaap	Interest Expense InterestExpense	5372000	USD
	us-gaap	Interest Expense InterestExpense	10904000	USD
CY2021Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	53000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-5530000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	175062000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-28443000	USD
CY2021Q3	us-gaap	Assets Assets	1272868000	USD
CY2020Q4	us-gaap	Assets Assets	1090346000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P25Y
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26274000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	29203000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	455000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	486000	USD
CY2021Q3	cohu	Lease Rightofuse Asset LeaseRightofuseAsset	26729000	USD
CY2020Q4	cohu	Lease Rightofuse Asset LeaseRightofuseAsset	29689000	USD
CY2021Q3	cohu	Lease Liability LeaseLiability	28271000	USD
CY2020Q4	cohu	Lease Liability LeaseLiability	31253000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y3M18D
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y3M18D
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.063	pure
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.063	pure
CY2021Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.007	pure
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.000	pure
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	100000	USD
CY2021Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	1799000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	2074000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	5866000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	6337000	USD
CY2021Q3	us-gaap	Variable Lease Cost VariableLeaseCost	508000	USD
CY2020Q3	us-gaap	Variable Lease Cost VariableLeaseCost	523000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	1634000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	1602000	USD
CY2021Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1000	USD
CY2020Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	15000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	68000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	53000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	21000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	17000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	66000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	65000	USD
CY2021Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
CY2020Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	57000	USD
CY2021Q3	us-gaap	Sublease Income SubleaseIncome	21000	USD
CY2020Q3	us-gaap	Sublease Income SubleaseIncome	31000	USD
	us-gaap	Sublease Income SubleaseIncome	61000	USD
	us-gaap	Sublease Income SubleaseIncome	94000	USD
CY2021Q3	us-gaap	Lease Cost LeaseCost	2308000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	2598000	USD
	us-gaap	Lease Cost LeaseCost	7574000	USD
	us-gaap	Lease Cost LeaseCost	8020000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	1671000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	46000	USD
CY2021Q3	cohu	Lessee Lease Liability Payments Remainder Of Fiscal Year LesseeLeaseLiabilityPaymentsRemainderOfFiscalYear	1717000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6322000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	184000	USD
CY2021Q3	cohu	Lessee Lease Liability Payments Due Next Twelve Months LesseeLeaseLiabilityPaymentsDueNextTwelveMonths	6506000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5371000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	40000	USD
CY2021Q3	cohu	Lessee Lease Liability Payments Due Year Two LesseeLeaseLiabilityPaymentsDueYearTwo	5411000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	5043000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	11000	USD
CY2021Q3	cohu	Lessee Lease Liability Payments Due Year Three LesseeLeaseLiabilityPaymentsDueYearThree	5054000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4914000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	11000	USD
CY2021Q3	cohu	Lessee Lease Liability Payments Due Year Four LesseeLeaseLiabilityPaymentsDueYearFour	4925000	USD
CY2021Q3	cohu	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	12232000	USD
CY2021Q3	cohu	Finance Lease Liability To Be Paid After Year Four FinanceLeaseLiabilityToBePaidAfterYearFour	3000	USD
CY2021Q3	cohu	Lessee Lease Liability Payments Due After Year Four LesseeLeaseLiabilityPaymentsDueAfterYearFour	12235000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	35553000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	295000	USD
CY2021Q3	cohu	Lessee Lease Liability Payments Due LesseeLeaseLiabilityPaymentsDue	35848000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	7573000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	4000	USD
CY2021Q3	cohu	Lessee Lease Liability Undiscounted Excess Amount LesseeLeaseLiabilityUndiscountedExcessAmount	7577000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	291000	USD
CY2021Q3	cohu	Lease Liability LeaseLiability	28271000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	100000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	5953000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	6207000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	57000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	142000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	104000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	54000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	468000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3669000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1830000	USD
CY2021Q3	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	pure
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	432000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	11000	USD
	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	35000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	46000	USD
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	4000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	42000	USD
	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	<table border="0" cellpadding="0" cellspacing="0" style="width: 100%; text-indent: 0px;"><tbody><tr style="vertical-align: top;"><td style="width: 27pt;"> <p style="margin: 0pt; text-align: justify; font-family: "Times New Roman"; font-size: 10pt;"><b><em style="font: inherit;">13.</em></b></p> </td><td style="width: auto;"> <p style="margin: 0pt; text-align: justify; font-family: "Times New Roman"; font-size: 10pt;"><b>Contingencies</b></p> </td></tr> </tbody></table> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 28pt;">From time-to-time we are involved in various legal proceedings, examinations by various tax authorities and claims that have arisen in the ordinary course of our business. The outcome of any litigation is inherently uncertain. While there can be <em style="font: inherit;">no</em> assurance, we do <em style="font: inherit;">not</em> believe at the present time that the resolution of these matters will have a material adverse effect on our assets, financial position or results of operations.</p>
CY2021Q2	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7541000	USD
CY2020Q2	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	5996000	USD
CY2020Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	6382000	USD
CY2019Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	6155000	USD
CY2021Q3	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	4148000	USD
CY2020Q3	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	911000	USD
	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	9800000	USD
	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	3846000	USD
CY2021Q3	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	3005000	USD
CY2020Q3	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	1169000	USD
	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	6553000	USD
	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	4263000	USD
CY2021Q3	cohu	Standard And Extended Product Warranty Accrual Decrease For Disposals StandardAndExtendedProductWarrantyAccrualDecreaseForDisposals	-0	USD
CY2020Q3	cohu	Standard And Extended Product Warranty Accrual Decrease For Disposals StandardAndExtendedProductWarrantyAccrualDecreaseForDisposals	-0	USD
	cohu	Standard And Extended Product Warranty Accrual Decrease For Disposals StandardAndExtendedProductWarrantyAccrualDecreaseForDisposals	945000	USD
	cohu	Standard And Extended Product Warranty Accrual Decrease For Disposals StandardAndExtendedProductWarrantyAccrualDecreaseForDisposals	-0	USD
CY2021Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8684000	USD
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	5738000	USD
CY2021Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8684000	USD
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	5738000	USD

Files In Submission

Name	View Source	Status
0001437749-21-024650-index-headers.html	Edgar Link	pending
0001437749-21-024650-index.html	Edgar Link	pending
0001437749-21-024650.txt	Edgar Link	pending
0001437749-21-024650-xbrl.zip	Edgar Link	pending
cohu-20210925.xsd	Edgar Link	pending
cohu-20210925_cal.xml	Edgar Link	unprocessable
cohu-20210925_def.xml	Edgar Link	unprocessable
cohu-20210925_lab.xml	Edgar Link	unprocessable
cohu-20210925_pre.xml	Edgar Link	unprocessable
cohu20210926_10q.htm	Edgar Link	pending
cohu20210926_10q_htm.xml	Edgar Link	completed
ex_295950.htm	Edgar Link	pending
ex_295951.htm	Edgar Link	pending
ex_295952.htm	Edgar Link	pending
ex_295953.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$COHU
COHU INC Stock $cohu

2021 Q4 Form 10-Q Financial Statement

#000143774921024650 Filed on October 29, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COHU COHU INC Stock $cohu

2021 Q4 Form 10-Q Financial Statement

#000143774921024650 Filed on October 29, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COHU
COHU INC Stock $cohu