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Basis of Presentation - Fair Value of Foreign Exchange Forward Contracts (Detail) (Derivatives Not Designated as Hedging Instruments, Foreign exchange forward contracts, Other assets, USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
May 31, 2014
Derivatives Not Designated as Hedging Instruments | Foreign exchange forward contracts | Other assets
    
Derivatives Not Designated as Hedging Instruments    
Foreign exchange forward contracts, liabilities recorded in other assets $ (4)us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		  
Foreign exchange forward contracts Other assets   $ 9us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember