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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
May 31, 2018
May 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets (liabilities) at fair value $ 159,945 $ 146,476
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 23,049 22,119
Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 467 797
Domestic | Stocks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis   2,467
Mutual funds | Domestic    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 107,017 101,637
Mutual funds | Foreign    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis 47,410 37,435
Contingent consideration liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration (17,998) (17,979)
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   2,467
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic | Stocks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on recurring basis   2,467
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets (liabilities) at fair value 177,943 161,988
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 23,049 22,119
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 467 797
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 107,017 101,637
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 47,410 37,435
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets (liabilities) at fair value (17,998) (17,979)
Significant Unobservable Inputs (Level 3) | Contingent consideration liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration $ (17,998) $ (17,979)