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Net Periodic Benefit Cost (Narratives) (Details) | 12 Months Ended
--- | ---
Mar. 31, 2020 USD ($)
Scenario, Forecast [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Planned contributions to pension plans in fiscal 2019 | $ 10,992,000

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | cmco_DefinedBenefitPlanExpectedContributionByEmployer
Namespace Prefix: | cmco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |