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Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011 | Dec. 25, 2010
Schedule Defined Contribution Benefit Plan [Line Items] |  |  |
Percentage match by company applicable to first 3 percent of employee's contribution | 100.00% |  |
Percentage match by company applicable to next 3 percent of employee's contribution | 50.00% |  |
Maximum percentage of employee's eligible compensation eligible for 100% match (in hundredths) | 3.00% |  |
Maximum percentage of employee's compensation eligible for 50% match | 6.00% |  |
Company maximum match as a percentage of eligible compensation (in hundredths) | 4.50% |  |
Defined Contribution Plan, Cost Recognized | $ 4.4 | $ 4.3 | $ 3.7

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- Definition Represents the maximum company match as a percentage of eligible compensation to be paid by the entity in a defined contribution plan. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the maximum percentage of employee's compensation eligible for 100% match to be paid by the entity in a defined contribution plan. + References No definition available. + Details
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- Definition Represents the maximum percentage of employee's compensation eligible for 50% match to be paid by the entity in a defined contribution plan. + References No definition available. + Details
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Balance Type: | na
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- Definition Represents the percentage matched by company in a defined benefit plan, applicable to 0-3% of employee's contribution. + References No definition available. + Details
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- Definition Represents the percentage matched by company in a defined benefit plan, applicable to the next 3-6% of employee's contribution. + References No definition available. + Details
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -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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