Revenue Accounting for Contracts / Accounting for Joint Ventures (Subcontractor Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 30, 2012	Apr. 01, 2011	Mar. 30, 2012	Apr. 01, 2011
Revenue Accounting for Contracts / Accounting for Joint Ventures [Abstract]
Pass-through costs included in revenues	$ 572,220	$ 540,960	$ 1,116,052	$ 1,075,848