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SEGMENT AND GEOGRAPHIC INFORMATION Revenue and Capital Assets by Geographic Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Segment Reporting Information [Line Items]
Revenue	$ 1,681,432	$ 1,363,302	$ 1,297,662
Long-lived assets	755,827	677,959	676,797
U.S.
Segment Reporting Information [Line Items]
Revenue	850,422	659,466	588,531
Long-lived assets	462,330	402,238	386,624
Europe
Segment Reporting Information [Line Items]
Revenue	520,937	435,491	446,263
Long-lived assets	177,423	159,445	153,203
Canada
Segment Reporting Information [Line Items]
Revenue	194,210	172,349	163,490
Long-lived assets	78,866	77,535	95,272
Japan
Segment Reporting Information [Line Items]
Revenue	46,829	40,520	49,921
Long-lived assets	20,941	22,348	23,896
Other Non-U.S.
Segment Reporting Information [Line Items]
Revenue	69,034	55,476	49,457
Long-lived assets	$ 16,267	$ 16,393	$ 17,802

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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