Reportable Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Revenue by client sector
Revenue	$ 684,698	$ 673,792	$ 1,991,670	$ 1,897,482
International
Revenue by client sector
Revenue	170,055	156,759	484,767	433,339
U.S. commercial
Revenue by client sector
Revenue	183,601	157,103	503,469	404,310
U.S. federal government
Revenue by client sector
Revenue	245,050	284,144	769,167	852,175
U.S. state and local government
Revenue by client sector
Revenue	$ 85,992	$ 75,786	$ 234,267	$ 207,658