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Accounts Receivable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Accounts Receivable    
Billed $ 2,267,600 $ 2,426,200
Unbilled 1,890,200 2,099,800
Contract retentions 434,100 379,600
Total accounts receivable-gross 4,591,900 4,905,600
Allowance for doubtful accounts (60,400) (64,100)
Total accounts receivable-net $ 4,531,460 $ 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 $ 356,300 $ 240,800