Mergers and Acquisitions (Details) (USD $)	6 Months Ended
	Apr. 01, 2012	Apr. 03, 2011	Oct. 02, 2011	Oct. 05, 2010
BPR, Inc.
Business acquisition
Aggregate purchase price				$ 185,679,000
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
Contingent consideration accrued as part of Estimated contingent earn-out liabilities	40,700,000		64,100,000
Contingent consideration accrued as part of Other long-term liabilities	9,600,000		11,000,000
Earn-outs paid to former shareholders	20,500,000	10,300,000
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	1,800,000	10,300,000
Prior to 2010 acquisitions
Estimated fair values of the assets acquired and liabilities assumed
Contingent consideration that will be recorded as an addition to goodwill if earned	16,000,000
2011 acquisitions
Business acquisition
Aggregate purchase price			100,000,000
Estimated fair values of the assets acquired and liabilities assumed
Net assets acquired			100,000,000
Estimated fair value of contingent earn-out payments on acquisition			$ 58,500,000