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Receivables
6 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Receivables
Receivables
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


We securitize certain trade receivables in transactions that are accounted for as secured borrowings (Securitization Program). We maintain a subordinated interest in a portion of the pool of trade receivables that are securitized. The retained interest, which is included in Receivables in the consolidated condensed balance sheets, is recorded at fair value, which approximates the total amount of the designated pool of accounts receivable. Refer to Note 6, Indebtedness, for additional disclosures related to the Securitization Program.