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SEGMENT AND GEOGRAPHIC INFORMATION - Revenue and Long-Lived Assets by Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 601,530	$ 585,295	$ 585,301	$ 493,970	$ 478,477	$ 464,232	$ 469,129	$ 445,763	$ 2,266,096	$ 1,857,601	$ 1,681,432
Long-lived assets	932,877				781,973				932,877	781,973	755,827
U.S.
Segment Reporting Information [Line Items]
Revenue									1,267,620	959,263	850,422
Long-lived assets	597,223				446,574				597,223	446,574	462,330
Europe
Segment Reporting Information [Line Items]
Revenue									643,957	569,812	520,937
Long-lived assets	205,185				203,911				205,185	203,911	177,423
Canada
Segment Reporting Information [Line Items]
Revenue									206,382	200,343	194,210
Long-lived assets	74,051				82,228				74,051	82,228	78,866
Asia Pacific
Segment Reporting Information [Line Items]
Revenue									142,495	126,462	114,710
Long-lived assets	56,262				49,020				56,262	49,020	37,111
Other
Segment Reporting Information [Line Items]
Revenue									5,642	1,721	1,153
Long-lived assets	$ 156				$ 240				$ 156	$ 240	$ 97

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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