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Fair Value - Summary Showing Reconciliation of the Contingent Payments (Detail) - USD ($)
$ in Thousands
6 Months Ended
Nov. 30, 2015
May. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Currency Translation Adjustment $ (96)  
November 30, 2014 $ 37,849 $ 47,384