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Components of Changes in Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, beginning balance     $ (3,581)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Other comprehensive loss before reclassifications     (50,095)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax  
Reclassification adjustments to income     3,058us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax [1]  
Income taxes 6,086us-gaap_OtherComprehensiveIncomeLossTax (273)us-gaap_OtherComprehensiveIncomeLossTax 6,596us-gaap_OtherComprehensiveIncomeLossTax (2,050)us-gaap_OtherComprehensiveIncomeLossTax
Accumulated other comprehensive loss, ending balance (44,022)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax   (44,022)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, beginning balance     11,015us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		  
Other comprehensive loss before reclassifications     (29,281)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		  
Accumulated other comprehensive loss, ending balance (18,266)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		   (18,266)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		  
Pension Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, beginning balance     (11,265)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Other comprehensive loss before reclassifications     (1,072)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Income taxes     371us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Accumulated other comprehensive loss, ending balance (11,966)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		   (11,966)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, beginning balance     (3,331)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Other comprehensive loss before reclassifications     (19,742)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Reclassification adjustments to income     3,058us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 [1]  
Income taxes     6,225us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Accumulated other comprehensive loss, ending balance $ (13,790)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		   $ (13,790)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
[1] The statement of earnings classification of amounts reclassified to income for cash flow hedges is disclosed in "NOTE P - Derivative Instruments and Hedging Activities."