Financing Obligations (Use of Proceeds) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009	Jul. 02, 2011 Old Credit Facility [Member] Term Loans [Member]	Jul. 02, 2011 Old Credit Facility [Member] Term Loans [Member] Interest Expense [Member]	Jul. 02, 2011 Credit Agreement [Member]	Dec. 31, 2011 Credit Agreement [Member]	Jun. 02, 2011 Credit Agreement [Member]	Dec. 31, 2011 Uncommitted Lines of Credit [Member]
Debt Instrument [Line Items]
Term loans amount repaid				$ 405
Unamortized debt issuance costs charged to interest expense				0.9
Interest rate swap impairment	18.9	0	0		18.9
Incurred costs for Notes offering and execution of new Credit Agreement	3.0	0	0			5.8
Incurred costs expensed						0.2
Incurred costs capitalized as deferred finance costs						5.6
Facility Amount								450
Unused lines of credit	359.9						254.6		105.3
Interest paid on debt	$ 36.0	$ 25.7	$ 32.6