Mergers and Acquisitions (Details) (USD $)	12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Business acquisition
Estimated fair value of contingent earn-out obligations	$ 7,000,000
Estimated contingent earn-out payments of aggregate maximum upon achievement of specified financial objectives	66,000,000
Estimated fair values of the assets acquired and liabilities assumed
Goodwill	714,190,000	722,792,000	635,958,000
Estimated contingent earn-out liabilities
Beginning balance (at fair value)	81,789,000	51,539,000	75,159,000
Estimated earn-out liabilities for acquisition during the fiscal year	6,242,000	75,253,000	18,981,000
Increases due to re-measurement of fair value reported in interest expense	1,846,000	2,433,000	1,374,000
Net decreases due to re-measurement of fair value reported as gains in operating income	(58,694,000)	(9,560,000)	(19,246,000)
Net gains on fair value adjustment in operating income	58,700,000	9,600,000	19,200,000
Foreign exchange impact	(3,507,000)	(2,480,000)	3,027,000
Earn-out payments
Reported as cash used in operating activities	(1,984,000)	(695,000)	(601,000)
Reported as cash used in investing activities		(1,279,000)	(11,773,000)
Reported as cash used in financing activities	(18,662,000)	(33,672,000)	(18,055,000)
Settlement of receivables due from sellers			(7,301,000)
Ending balance (at fair value)	7,030,000	81,789,000	51,539,000
Maximum
Business acquisition
Period for contingent earn-out payments	3 years
Minimum
Business acquisition
Period for contingent earn-out payments	2 years
Prior to 2010 acquisitions
Estimated contingent earn-out liabilities
Estimated earn-out liabilities for acquisition during the fiscal year		250,000	9,974,000
AEG, Parkland and other 2013 acquisitions
Business acquisition
Estimated fair value of purchase prices		248,900,000
Initial payment		171,600,000
Estimated fair value of contingent earn-out obligations		75,300,000
Estimated contingent earn-out payments of aggregate maximum upon achievement of specified financial objectives		86,700,000
Estimated fair values of the assets acquired and liabilities assumed
Goodwill	134,000,000
Net assets acquired		248,900,000
Liabilities		2,000,000
2012 acquisitions
Business acquisition
Estimated fair value of purchase prices			63,200,000
Initial payment			42,200,000
Estimated fair value of contingent earn-out obligations			19,000,000
Estimated contingent earn-out payments of aggregate maximum upon achievement of specified financial objectives			20,000,000
Estimated fair values of the assets acquired and liabilities assumed
Net assets acquired			63,200,000
Amount accrued			2,000,000
Parkland
Estimated fair values of the assets acquired and liabilities assumed
Goodwill	$ 95,600,000