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Accounts Receivable-Net (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Accounts Receivable-Net    
Billed $ 2,298,100 $ 2,426,200
Unbilled 1,941,300 2,099,800
Contract retentions 436,200 379,600
Total accounts receivable-gross 4,675,600 4,905,600
Allowance for doubtful accounts (55,200) (64,100)
Total accounts receivable-net $ 4,620,393 $ 4,841,450
Period in which unbilled receivables are expected to be billed and collected 12 months 12 months
Total receivables sold that remain outstanding $ 278,400 $ 240,800