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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2012 segment	Dec. 29, 2011 segment	Dec. 30, 2010 segment
Schedule of Equity Method Investments [Line Items]
Deferred revenue related to ESA	$ 24.1	$ 24.4
Segment Reporting [Abstract]
Number of Reportable Segments (in segments)	1	1	1
National Cine Media
Schedule of Equity Method Investments [Line Items]
Deferred revenue related to ESA	$ 24.5	$ 24.9

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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