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Commitments and Contingencies (Details) $ in Millions	9 Months Ended
Commitments and Contingencies (Details) $ in Millions	Sep. 26, 2015 USD ($) vendor	Dec. 27, 2014 USD ($)	Sep. 27, 2014 USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Letters of Credit Outstanding, Amount	$ 42.8	$ 40.7	$ 41.1
Information about Litigation Matters
Number of vendors company purchased engines \| vendor	1
Number of wood burning stoves	22
DC Construction Project
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase Obligation, Due in Next Twelve Months	$ 6.3