Income Taxes (Details) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013 USD ($)	Mar. 30, 2013 CAD	Sep. 29, 2012 USD ($)
Income Taxes
Capital loss carryforward	$ 17.7
Net operating loss carryforward	11.5
Unrecognized tax benefits	21.7		24.0
Unrecognized tax benefits that would impact effective tax rate	18.2
Indemnified amount of unrecognized tax benefits	14.1
Maximum amount of unrecognized tax benefit indemnification		37.9
Accrued interest and penalties	1.7		0.6
Unrecognized tax benefits amount released	2.2
Unrecognized tax benefits expected to be released during the remainder of fiscal 2013 due to expiration of the statute of limitations	$ 1.5