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Accounts Receivable, Net - Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Receivables [Abstract]    
Accounts receivable - billed $ 664,099 $ 723,921
Accounts receivable - unbilled 229,695 134,122
Less - allowances (28,726) (39,512)
Accounts receivable, net $ 865,068 $ 818,531