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Fair Value Measurements (Narrative) (Details) (Senior Notes Due 2021 [Member], USD $) In Millions, unless otherwise specified	Mar. 28, 2015	Dec. 27, 2014	Jun. 02, 2011
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Stated interest rate			4.75%
Long-term Debt	$ 599.2us-gaap_LongTermDebt	$ 599.2us-gaap_LongTermDebt
Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 643.2

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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