Receivables

The following table presents the components of “Receivables” appearing in the accompanying Consolidated Balance Sheets at December 30, 2011 and September 30, 2011 as well as certain other related information (in thousands):



	December 30, 2011		September 30, 2011
Components of receivables:
Amounts billed	$	1,013,658	$	1,016,792
Unbilled receivables and other	955,693		996,516
Retentions receivable	57,622		64,186
Total receivables, net	$	2,026,973	$	2,077,494
Other information about receivables:
Amounts due from the United States federal government, included above, net of advanced billings	$	266,036	$	288,165
Claims receivable	$	17,700	$	14,712

Unbilled receivables and retentions receivable represent reimbursable costs and amounts earned and reimbursable under contracts in progress as of the respective balance sheet dates. Such amounts become billable according to the contract terms, which usually consider the passage of time, achievement of certain milestones or completion of the project. We anticipate that substantially all of such unbilled amounts will be billed and collected over the next twelve months.

Claims receivable are included in “Receivables” in the accompanying Consolidated Balance Sheets and represent certain costs incurred on contracts to the extent it is probable that such claims will result in additional contract revenue and the amount of such additional revenue can be reliably estimated.