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Accounts Receivable, Net - Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Receivables [Abstract]    
Accounts receivable - billed $ 668,424 $ 617,712
Accounts receivable - unbilled 80,197 134,523
Less - allowances (33,837) (36,398)
Accounts receivable, net $ 714,784 $ 715,837