Employee Stock Ownership (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
ESOP shares allocated or available to be allocated to participants' accounts	$ 216	$ 234

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No definition available.

Name:	cmco_EmployeeStockOwnershipPlanNumberOfAllocatedOrAvailableToBeAllocatedShares
Namespace Prefix:	cmco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant