Receivables

Receivables consist of:



	September 30, 2017			October 1, 2016
Accounts receivable	$	286,773		$	306,469
Long-term contract receivables:
Amounts billed	148,087			130,429
Unbilled recoverable costs and accrued profits	282,154			245,376
Total long-term contract receivables	430,241			375,805
Other	15,077			10,652
Total receivables	732,091			692,926
Less allowance for doubtful accounts	(4,351		)	(4,538		)
Receivables	$	727,740		$	688,388

Under our trade receivables securitization facility (the "Securitization Program"), we securitize certain trade receivables in transactions that are accounted for as secured borrowings. 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 balance sheets, is recorded at fair value, which approximates the total amount of the designated pool of accounts receivable. See Note 7, Indebtedness, for additional disclosures related to the Securitization Program.

Long-term contract receivables are primarily associated with prime contractors and subcontractors in connection with U.S. Government contracts, as well as commercial aircraft and satellite manufacturers. Amounts billed under long-term contracts to the U.S. Government were $2,966 at September 30, 2017 and $2,535 at October 1, 2016. Unbilled recoverable costs and accrued profits under long-term contracts to be billed to the U.S. Government were $16,720 at September 30, 2017 and $12,195 at October 1, 2016. Unbilled recoverable costs and accrued profits principally represent revenues recognized on contracts that were not billable on the balance sheet date. These amounts will be billed in accordance with contract terms, generally as certain milestones are reached or upon shipment. Approximately 96% of unbilled amounts are expected to be collected within one year. In situations where billings exceed revenues recognized, the excess is included in customer advances.

There are no material amounts of claims or unapproved change orders included in the consolidated balance sheets. There are no material balances billed but not paid by customers under retainage provisions.

Concentrations of credit risk on receivables are limited to those from significant customers who are believed to be financially sound. Receivables from Boeing were $142,876 at September 30, 2017 and $169,199 at October 1, 2016. We perform periodic credit evaluations of our customers’ financial condition and generally do not require collateral.