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Segment and Geographic Information Unallocated Corporate Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Segment Reporting Information [Line Items] |  |  |
Stock-based compensation | $ 40,122 | $ 31,035 | $ 24,542
Depreciation expense | 70,700 | 70,500 | 78,800
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Stock-based compensation | 25,751 | 18,474 | 13,411
Salary, bonus and fringe | 33,026 | 30,838 | 23,446
Consulting, audit and professional services | 15,418 | 13,431 | 8,666
IT related expenses | 8,400 | 6,528 | 11,646
Depreciation expense | 7,414 | 7,703 | 6,334
Acquisition related adjustments | 11,644 | 6,285 | 1,752
Other general unallocated corporate expenses | 9,527 | 8,816 | 8,721
Total unallocated corporate overhead costs | $ 111,180 | $ 92,075 | $ 73,976

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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