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Receivables - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Aug. 31, 2015
May. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unbilled revenues $ 29,665 $ 18,387
Allowance for doubtful accounts (3,475) (2,775)
Total 210,140 212,934
Trade accounts receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade accounts receivable $ 183,950 $ 197,322