Mergers and Acquisitions (Details) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended				3 Months Ended				6 Months Ended	3 Months Ended				6 Months Ended	12 Months Ended
	Mar. 30, 2014 USD ($)	Mar. 29, 2015 USD ($) item	Mar. 30, 2014 USD ($)	Mar. 29, 2015 Maximum	Mar. 29, 2015 Minimum	Mar. 29, 2015 Caber USD ($)	Mar. 29, 2015 Caber CAD	Sep. 28, 2014 Caber USD ($)	Dec. 29, 2013 Caber CAD	Mar. 29, 2015 Caber USD ($)	Sep. 28, 2014 Parkland USD ($)	Mar. 30, 2014 Parkland USD ($)	Dec. 29, 2013 Parkland USD ($)	Mar. 31, 2013 Parkland CAD	Mar. 30, 2014 Parkland USD ($)	Sep. 28, 2014 Parkland USD ($)
Business acquisition
Number of acquisitions		0
Contingent earn-out liability		$ 0				$ 0				$ 0	$ 0	$ 0	$ 0		$ 0	$ 0
Aggregate maximum of contingent consideration		20.6							8.0
Earn-out period for operating income projection				3 years	2 years				2 years					3 years
Decreases (increase) in contingent earn-out liabilities						3.1		(1.0)		3.1		21.3			26.0
Net decrease in contingent earn-out liabilities																44.6
Gains on fair value adjustment in operating income	5.6					3.1				3.1		21.3			26.0
Net gains on fair value adjustments in operating income																44.6
Earn-out paid to former owners		3.2	10.6			3.2	4.0
Potential earn-out to be paid each year									4.0
Potential maximum earn-out to be paid									4.0					56.0
Potential earn-out to be paid in the first year														12.0
Potential earn-out to be paid in the second year														22.0
Potential earn-out to be paid in the third year														22.0
Minimum operating income threshold to earn contingent consideration during year one									4.0					34.7
Minimum operating income threshold to earn contingent consideration during year two									4.6					38.2
Minimum operating income threshold to earn contingent consideration during year three														41.9
Operating income to earn maximum consideration during the first year									4.4					42.5
Operating income to earn maximum consideration during the second year									5.1					46.4
Operating income to earn maximum consideration during the third year														50.6
Initial fair value of the contingent consideration									6.5					46.8
Estimated potential earn-out (as a percent)									81.00%					84.00%
Gain (loss) on change in contingent consideration						3.1		(1.0)			19.9	19.1	5.6		24.7
Profit previously recognized on project												5.3
Earn-outs paid to former owners reported as cash used in financing activities		3.2	9.3
Earn-outs paid to former owners reported as cash used in operating activities			$ 1.3