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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended
Feb. 28, 2015
May 31, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Total cash collateral $ 6,300,000us-gaap_CashCollateralForBorrowedSecurities  
Impact to fair value of derivative assets and liabilities as a result of recognition on a net basis 345,000wor_ImpactToFairValueOfDerivativeAssetsAndLiabilitiesAsResultOfRecognitionOnNetBasis 730,000wor_ImpactToFairValueOfDerivativeAssetsAndLiabilitiesAsResultOfRecognitionOnNetBasis
Losses in accumulated other comprehensive income expected to be reclassified into net earnings 11,742,000us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred  
Losses in accumulated other comprehensive income expected to be reclassified into net earnings, tax $ 6,982,000wor_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferredTax