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Components of Changes in Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
May 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, beginning balance     $ (3,581)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Other comprehensive loss before reclassifications     (20,115)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax    
Reclassification adjustments to income     3,437us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax [1]    
Income taxes 1,092us-gaap_OtherComprehensiveIncomeLossTax (308)us-gaap_OtherComprehensiveIncomeLossTax 510us-gaap_OtherComprehensiveIncomeLossTax (1,777)us-gaap_OtherComprehensiveIncomeLossTax  
Accumulated other comprehensive loss, ending balance (19,749)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax   (19,749)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     (15,237)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		    
Accumulated other comprehensive loss, ending balance (4,222)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		   (4,222)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
Accumulated other comprehensive loss, ending balance (11,265)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		   (11,265)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		   (11,265)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     (4,878)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Reclassification adjustments to income     3,437us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 [1]    
Income taxes     510us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Accumulated other comprehensive loss, ending balance $ (4,262)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		   $ (4,262)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 O - Derivative Instruments and Hedging Activities."