Reportable Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 29, 2013	Dec. 30, 2012
Revenue by client sector
Threshold percentage for disclosure of revenue from a single client	10.00%
Revenue	$ 645,848	$ 658,545
Revenue
Revenue by client sector
Number of clients exceeding threshold	0
International
Revenue by client sector
Revenue	163,933	167,518
U.S. commercial
Revenue by client sector
Revenue	186,296	173,141
U.S. federal government
Revenue by client sector
Revenue	195,184	227,390
U.S. state and local government
Revenue by client sector
Revenue	$ 100,435	$ 90,496