Mergers and Acquisitions (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011	Oct. 02, 2011	Jul. 01, 2012 Maximum Y	Jul. 01, 2012 Minimum Y	Oct. 05, 2010 BPR, Inc.	Jul. 01, 2012 Prior to 2010 acquisitions Maximum	Jul. 01, 2012 2012 acquisitions	Oct. 02, 2011 2011 acquisitions
Business acquisition
Aggregate purchase price								$ 185,679,000		$ 65,000,000	$ 100,000,000
Estimated fair values of the assets acquired and liabilities assumed
Current assets								77,698,000
Property and equipment								7,178,000
Goodwill								128,140,000
Intangible and other assets								36,988,000
Current liabilities								(42,481,000)
Long-term deferred taxes								(9,622,000)
Noncontrolling interests								(12,222,000)
Net assets acquired								185,679,000		65,000,000	100,000,000
Estimated fair value of contingent earn-out payments on acquisition										19,000,000	58,500,000
Contingent consideration that will be recorded as an addition to goodwill if earned									6,000,000
Contingent consideration accrued as part of Estimated contingent earn-out liabilities	48,300,000		48,300,000		64,100,000
Period for contingent earn-out payments (in years)						3	2
Contingent consideration earned and accrued as part of Contingent earn-out liabilities						80,500,000
Gain due to estimated fair value related to changes in unobservable inputs	1,700,000	1,100,000	2,000,000	1,600,000
Contingent consideration accrued as part of Other long-term liabilities	19,000,000		19,000,000		11,000,000
Earn-outs paid to former shareholders			30,400,000	21,800,000
Earn-outs paid to former shareholders reported as cash flows used in financing activities			18,100,000
Earn-outs paid to former shareholders reported as cash flows used in operating activities			600,000
Earn-outs paid to former shareholders reported as cash flows used in investing activities			$ 11,700,000	$ 21,800,000