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Summary of Changes in Other Comprehensive Income Included Within Shareholders Equity (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period $ (2,679) $ (1,789)
Other comprehensive income (loss) before tax (1,044) (777)
Non-controlling interest 6 18
Balance, end of period (3,717) (2,548)
Foreign Currency Translation Adjustments
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period (5,145) (3,532)
Other comprehensive income (loss) before tax (1,524) (929)
Non-controlling interest 6 18
Balance, end of period (6,663) (4,443)
Foreign Currency Hedges
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period 1,229 2,004
Other comprehensive income (loss) before tax 597 (362)
Balance, end of period 1,826 1,642
Tax Provision
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period 1,237 (261)
Other comprehensive income (loss) before tax (117) 514
Balance, end of period $ 1,120 $ 253