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Commitments and Contingencies (Details) $ in Millions	6 Months Ended
Commitments and Contingencies (Details) $ in Millions	Jun. 27, 2015 USD ($) vendor	Dec. 27, 2014 USD ($)	Jun. 28, 2014 USD ($)
Letters of Credit
Letters of credit outstanding, amount	$ 57.4	$ 40.7	$ 70.9
Information about Litigation Matters
Number of vendors company purchased engines \| vendor	1
DC Construction Project
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase obligation, due in next twelve months	$ 13.3
DC Mixing Center Project
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase obligation, due in next twelve months	$ 3.0