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Fair Value Measurements (Fair Value of Financial Instruments) (Details) (Fixed rate Senior Notes due 2021, USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013	Jun. 02, 2011
Fair Value of Financial Instruments [Line Items]
Stated interest rate			4.75%
Long-term Debt	$ 602.3us-gaap_LongTermDebt	$ 602.6us-gaap_LongTermDebt
Significant Other Observable Inputs (Level 2)
Fair Value of Financial Instruments [Line Items]
Long-term Debt, Fair Value	$ 642.0

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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