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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Stock-based compensation	$ 11,820	$ 11,526	$ 35,908	$ 32,902
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	7,910	7,255	24,517	20,259
Compensation, benefits, and other employee-related expenses	20,464	11,337	56,375	36,083
External consulting and other service expenses	4,767	6,729	12,711	16,581
Information technology	3,070	3,237	8,723	9,247
Depreciation	1,639	2,288	5,058	6,378
Acquisition and integration	1,122	1,327	15,678	2,539
Other general unallocated corporate	4,962	2,674	9,225	8,965
Total unallocated corporate expense	$ 43,934	$ 34,847	$ 132,287	$ 100,052

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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.

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