Summary of Significant Accounting Policies (Accounting for Stock-Based Compensation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation [Abstract]
Excess tax benefits from option exercises	$ 6.3	$ 14.5	$ 13.5

Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration