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SEGMENT AND GEOGRAPHIC INFORMATION Unallocated Corporate Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Segment Reporting Information [Line Items]
Stock-based compensation	$ 43,642	$ 40,122	$ 31,035
Depreciation expense	85,000	70,700	70,500
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	27,272	25,751	18,474
Salary, bonus, and fringe	39,189	33,026	30,838
Consulting, audit, and professional services	23,421	15,418	13,431
IT related expenses	13,233	8,400	6,528
Depreciation expense	8,423	7,414	7,703
Acquisition related adjustments	15,608	11,644	6,285
Other general unallocated corporate expenses	14,500	9,527	8,816
Total unallocated corporate overhead costs	$ 141,646	$ 111,180	$ 92,075

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Represents the sum total of audit, tax and related expenses.

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Amount of direct costs of the business combination or disposition including legal, accounting, and other costs incurred to consummate the business acquisition or disposition.

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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

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-Topic 225
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Amount of general expenses not normally included in Other Operating Costs and Expenses.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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