XML 54 R40.htm IDEA: XBRL DOCUMENT v3.3.1.900
Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2015
Nov. 30, 2014
May. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Settlements of contingent consideration obligations   $ 1,600    
Reversal for contingent earn out targets $ 14,500 14,500 $ 18,080  
Fair Value, Measurements, Recurring | Foreign currency forward contract        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Foreign currency contracts, fair value of liability $ 8,678 $ 8,678   $ 6,369