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Assets and Liabilities Measured at Fair Value on Recurring Basis and Categorized using Fair Value Hierarchy (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration $ (81,296) $ (69,020)
Assets (liabilities) at fair value 44,616 29,274
Foreign currency forward contract
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency forward contract 2,582  
Foreign currency contracts, fair value of liability   (4,751)
Cross-currency swap
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts, fair value of liability (19,550) (10,048)
U.S. Treasury and other government
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 21,144 20,636
Foreign bonds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 40 41
Mortgage-backed securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 140 156
Corporate bonds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 1,756 1,968
Stocks | Foreign
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 1,633 1,334
Stocks | Domestic
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 39,904 29,365
Mutual funds | Foreign
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 33,340 20,222
Mutual funds | Domestic
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 44,923 39,371
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets (liabilities) at fair value 41,537 30,699
Quoted Prices in Active Markets for Identical Assets (Level 1) | Stocks | Foreign
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 1,633 1,334
Quoted Prices in Active Markets for Identical Assets (Level 1) | Stocks | Domestic
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 39,904 29,365
Significant Other Observable Inputs (Level 2)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets (liabilities) at fair value 84,375 67,595
Significant Other Observable Inputs (Level 2) | Foreign currency forward contract
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency forward contract 2,582  
Foreign currency contracts, fair value of liability   (4,751)
Significant Other Observable Inputs (Level 2) | Cross-currency swap
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts, fair value of liability (19,550) (10,048)
Significant Other Observable Inputs (Level 2) | U.S. Treasury and other government
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 21,144 20,636
Significant Other Observable Inputs (Level 2) | Foreign bonds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 40 41
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 140 156
Significant Other Observable Inputs (Level 2) | Corporate bonds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 1,756 1,968
Significant Other Observable Inputs (Level 2) | Mutual funds | Foreign
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 33,340 20,222
Significant Other Observable Inputs (Level 2) | Mutual funds | Domestic
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 44,923 39,371
Significant Unobservable Inputs (Level 3)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration (81,296) (69,020)
Assets (liabilities) at fair value $ (81,296) $ (69,020)