Basis of Presentation and Preparation (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Jan. 01, 2012	Sep. 29, 2013	Sep. 30, 2012	Oct. 02, 2011
Revenue recognition and contract costs
Favorable (unfavorable) operating income adjustments	$ 40,626	$ (99,884)	$ 37,667	$ 41,809	$ 48,470	$ 46,261	$ 35,543	$ 36,093	$ 20,218	$ 166,367	$ 146,422
Contracts accounted for under the percentage-of-completion method of accounting
Revenue recognition and contract costs
Favorable (unfavorable) operating income adjustments									$ (40,100)	$ 500	$ (8,600)