Reportable Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Revenue by client sector
Threshold percentage for disclosure of revenue from a single client			10.00%
Revenue	$ 629,502	$ 614,835	$ 1,861,635	$ 1,915,379
Sales Revenue, Services, Net [Member]
Revenue by client sector
Number of clients exceeding threshold			0
International [Member]
Revenue by client sector
Revenue	141,553	158,579	487,056	522,921
Commercial [Member]
Revenue by client sector
Revenue	183,757	167,280	517,907	488,722
Federal Government [Member]
Revenue by client sector
Revenue	202,905	187,983	576,431	621,677
State and Local Government [Member]
Revenue by client sector
Revenue	$ 101,287	$ 100,993	$ 280,241	$ 282,059