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Share-Based Awards and Options - Share-based Compensation Expense and Income Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 7,005 $ 5,079 $ 13,472 $ 9,145
Income tax benefit $ 2,279 $ 1,720 $ 4,637 $ 2,824