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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended
Nov. 30, 2014
May 31, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Impact to fair value of derivative assets and liabilities as a result of recognition on a net basis $ 324,000wor_ImpactToFairValueOfDerivativeAssetsAndLiabilitiesAsResultOfRecognitionOnNetBasis $ 730,000wor_ImpactToFairValueOfDerivativeAssetsAndLiabilitiesAsResultOfRecognitionOnNetBasis
Losses in accumulated other comprehensive income expected to be reclassified into net earnings (2,118,000)us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred  
Losses in accumulated other comprehensive income expected to be reclassified into net earnings, tax $ 1,251,000wor_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferredTax