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Receivables (Schedule of Receivables) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Receivables [Abstract]    
Accounts receivable $ 293,967 $ 286,773
Long-term contract receivable - Amounts billed 138,862 148,087
Long-term contract receivable - Unbilled recoverable costs and accrued profits 297,527 282,154
Total long-term contract receivables 436,389 430,241
Other 31,987 15,077
Total receivables 762,343 732,091
Less allowance for doubtful accounts (4,888) (4,351)
Receivables $ 757,455 $ 727,740