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Share-Based Awards and Options - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 7,005 $ 5,079 $ 13,472 $ 9,145
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     17,600 14,600
Share-based compensation expense 6,400 $ 4,700 12,600 $ 8,500
Compensation not yet recognized $ 52,000   $ 52,000  
Total unrecognized compensation cost, weighted average period     2 years 3 months 18 days