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Employee Stock Ownership (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]      
Compensation expense recorded based on guaranteed release of ESOP shares at fair market value $ 251us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense $ 608us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense $ 422us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
ESOP shares allocated or available to be allocated to participants' accounts 423cmco_EmployeeStockOwnershipPlanNumberOfAllocatedOrAvailableToBeAllocatedShares 463cmco_EmployeeStockOwnershipPlanNumberOfAllocatedOrAvailableToBeAllocatedShares  
ESOP shares pledged as collateral to guarantee the ESOP term loans 0cmco_EmployeeStockOwnershipPlanSharesPledgedAsCollateralToGuaranteeESOPTermLoans 8cmco_EmployeeStockOwnershipPlanSharesPledgedAsCollateralToGuaranteeESOPTermLoans  
Fair market value of unearned ESOP shares $ 0us-gaap_UnearnedESOPShares $ 241us-gaap_UnearnedESOPShares