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Receivables (Tables)
6 Months Ended
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable
Receivables consist of:
 
 
March 31,
2018
 
September 30,
2017
Accounts receivable
 
$
296,761

 
$
286,773

Long-term contract receivables:
 
 
 
 
Amounts billed
 
153,489

 
148,087

Unbilled recoverable costs and accrued profits
 
291,256

 
282,154

Total long-term contract receivables
 
444,745

 
430,241

Other
 
34,191

 
15,077

Total receivables
 
775,697

 
732,091

Less allowance for doubtful accounts
 
(4,966
)
 
(4,351
)
Receivables
 
$
770,731

 
$
727,740