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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
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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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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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