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SEGMENT AND GEOGRAPHIC INFORMATION - Revenue and Long-Lived Assets by Geographic Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Segment Reporting Information [Line Items]
Revenue	$ 1,857,601	$ 1,681,432	$ 1,363,302
Long-lived assets	781,973	755,827	677,959
U.S.
Segment Reporting Information [Line Items]
Revenue	959,263	850,422	659,466
Long-lived assets	446,574	462,330	402,238
Europe
Segment Reporting Information [Line Items]
Revenue	569,812	520,937	435,491
Long-lived assets	203,911	177,423	159,445
Canada
Segment Reporting Information [Line Items]
Revenue	200,343	194,210	172,349
Long-lived assets	82,228	78,866	77,535
Asia Pacific
Segment Reporting Information [Line Items]
Revenue	126,462	114,710	95,996
Long-lived assets	49,020	37,111	38,741
Other
Segment Reporting Information [Line Items]
Revenue	1,721	1,153	0
Long-lived assets	$ 240	$ 97	$ 0

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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- Definition

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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