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Share Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 26, 2012 | Dec. 28, 2011 | Dec. 29, 2010
Equity, Class of Treasury Stock [Line Items] |  |  |
Common stock shares repurchased during the period (value in US$) | $ 22,179 | $ 21,569 | $ 3,890
Share Repurchase Program 2010 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares approved under stock repurchase program (shares) |  |  | 3,000,000
Common stock shares repurchased during the period (shares) |  |  | 1,000,000
Common stock shares repurchased during the period (value in US$) |  |  | 3,900
Share Repurchase Program 2011 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares approved under stock repurchase program (shares) |  | 6,000,000 |
Common stock shares repurchased during the period (shares) |  | 5,700,000 |
Common stock shares repurchased during the period (value in US$) |  | 21,600 |
Share Repurchase Program 2012 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares approved under stock repurchase program (shares) | 6,000,000 |  |
Common stock shares repurchased during the period (shares) | 4,800,000 |  |
Common stock shares repurchased during the period (value in US$) | $ 22,200 |  |
Remaining number of shares approved under stock repurchase program (shares) | 3,500,000 |  |

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7 -Subparagraph b -Chapter 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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