Mergers and Acquisitions (Details) (USD $)	3 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Sep. 30, 2012
Business acquisition
Contingent consideration accrued	$ 36,100,000
Contingent consideration accrued as part of Estimated contingent earn-out liabilities	20,089,000		35,407,000
Contingent consideration accrued as part of Other long-term liabilities	16,000,000		16,100,000
Earn-outs paid to former shareholders	22,400,000	11,200,000
Reported as cash used in financing activities	22,400,000	9,400,000
Reported as cash used in investing activities		1,800,000
Maximum
Business acquisition
Aggregate maximum of contingent consideration	42,800,000
Earn out period for operating income projection (in years)	3
Minimum
Business acquisition
Earn out period for operating income projection (in years)	2
Prior to 2010 acquisitions | Maximum
Business acquisition
Contingent consideration that will be recorded as an addition to goodwill if earned	$ 3,000,000