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Schedule II - Valuation and Qualifying Accounts (Details Textual) $ in Millions | Dec. 25, 2021 USD ($)
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Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | PCB Test Business Sale [Member] |
Reserve for excess and obsolete inventories not charged to expense PCB Test sale | $ 2.2

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=cohu_PCBNTestBusinessSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |