Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 543.3	$ 298.0	$ 250.0
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, estimated fair value	$ 632.5	$ 298.0