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Stock-Based Compensation Expense Included in Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Selling, general and administrative expense $ 31,741 $ 23,568 $ 17,145
Income tax (benefit) (10,027) (7,776) (5,627)
Total stock-based compensation cost $ 21,714 $ 15,792 $ 11,518