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Accounts Receivable, Net - Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Receivables [Abstract]    
Accounts receivable - billed $ 723,921 $ 668,424
Accounts receivable - unbilled 134,122 80,197
Less - allowances (39,512) (33,837)
Accounts receivable, net $ 818,531 $ 714,784