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Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended					12 Months Ended				1 Months Ended		12 Months Ended				12 Months Ended
	Dec. 26, 2012 plans	Dec. 28, 2011	Dec. 29, 2010	Dec. 26, 2012 Stock Options [Member]	Dec. 28, 2011 Stock Options [Member]	Dec. 26, 2012 Restricted stock units [Member]	Dec. 28, 2011 Restricted stock units [Member]	Dec. 29, 2010 Restricted stock units [Member]	Dec. 30, 2009 Restricted stock units [Member]	Feb. 29, 2012 Performance Shares [Member]	Dec. 26, 2012 Performance Shares [Member]	Dec. 26, 2012 Board Deferred Stock Units [Member]	Dec. 28, 2011 Board Deferred Stock Units [Member]	Dec. 26, 2012 2012 Omnibus Plan [Member]	Dec. 26, 2012 2008 Omnibus Plan [Member]	Dec. 26, 2012 2004 Omnibus Plan [Member]	Dec. 26, 2012 Maximum [Member] Board Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans	4
Shares reserved for issuance														4,500,000	4,500,000	10,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized			1,500,000													1,500,000
Days after termination date to exercise vested options	60 days
Days after termination date to exercise vested options for terminations by reason of disability, retirement or death	1 year
Vesting period				3 years
Contractual life				10 years
Aggregate intrinsic value of the options exercised	$ 1.7	$ 3.6	$ 5.6
Weighted-average fair value per option of options granted		$ 1.98	$ 1.31
Component of additional paid in capital related to stock options				19.3	17.4	4.1	4.5
Unrecognized compensation cost related to unvested stock option awards outstanding				0.6
Unrecognized compensation cost, expected weighted average period				0 years 9 months 18 days		1 year 3 months 18 days						0 years 3 months 18 days
Equity awards granted (shares)						397,000	416,000	619,000		400,000		200,000
Employee performance-based target cash awards										2.0
Equity awards, grant date fair value (US$ per share)						$ 6.05	$ 3.99	$ 2.29		$ 6.05		$ 4.05
Performance period										3 years
Minimum percentage of target awards to be earned (in hundredths)										0.00%
Maximum percentage of target awards to be earned (in hundredths)										200.00%
Equity award outstanding (shares)						933,000	1,276,000	1,450,000	2,009,000		300,000	700,000	500,000
Performance-based target cash awards outstanding											1.6
Accrued compensation included as a component of other current liabilities						0.4	0.5
Accrued compensation included as a component of other noncurrent liabilities						0.9	0.3
Cash payments						1.0
Common stock shares issued (in shares)						200,000											100,000
Unrecognized compensation cost related to all unvested restricted stock unit awards outstanding						$ 2.8						$ 0.2

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