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Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Loss) Included Within Shareholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period $ (13,538) $ (2,679)
Other comprehensive income before tax (2,843) (1,044)
Non-controlling interest 0 6
Balance, end of period (16,381) (3,717)
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period (20,896) (5,145)
Other comprehensive income before tax (3,977) (1,524)
Non-controlling interest   6
Balance, end of period (24,873) (6,663)
Foreign Currency Hedge [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period 4,466 1,229
Other comprehensive income before tax (238) 597
Balance, end of period 4,228 1,826
Tax Provision [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period 2,892 1,237
Other comprehensive income before tax 1,372 (117)
Balance, end of period $ 4,264 $ 1,120