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Debt - Fair Value of Long-term Debt (Details) (USD $)
Jun. 30, 2013
Dec. 30, 2012
Debt Disclosure [Abstract]    
Principal amount outstanding $ 630,300,000.0 $ 630,700,000.0
Carrying amount 646,900,000 649,400,000
Fair value 676,200,000 690,500,000
Long-term debt premium $ 16,600,000 $ 18,700,000