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Employee Stock Ownership (Narrative) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
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Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract] |  |
ESOP shares allocated or available to be allocated to participants' accounts | $ 234 | $ 280

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | cmco_EmployeeStockOwnershipPlanNumberOfAllocatedOrAvailableToBeAllocatedShares
Namespace Prefix: | cmco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOPAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration