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Accounts Receivable, Net - Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Receivables [Abstract]    
Accounts receivable - billed $ 728,716 $ 664,099
Accounts receivable - unbilled 263,997 229,695
Less - allowances (21,211) (28,726)
Accounts receivable, net $ 971,502 $ 865,068