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Debt - Fair Value of Long-term Debt (Details) (USD $)	Mar. 31, 2013	Dec. 30, 2012
Debt Disclosure [Abstract]
Principal amount outstanding	$ 630,500,000.0	$ 630,700,000.0
Carrying amount	648,200,000	649,400,000
Fair value	691,900,000	690,500,000
Long-term debt premium	$ 17,700,000	$ 18,700,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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