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Employee Stock Ownership (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
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