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RESTRUCTURING AND ASSET IMPAIRMENTS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		24 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 2,653,000	$ 4,675,000	$ 5,887,000	$ 7,169,000
Severance and other personnel related costs liability and lease obligation liabilities	3,783,000	7,062,000	3,783,000	7,062,000	$ 2,921,000	$ 2,758,000	$ 6,810,000	$ 6,856,000
Accrued Compensation
Restructuring Cost and Reserve [Line Items]
Severance and other personnel related costs liability and lease obligation liabilities	3,800,000	2,600,000	3,800,000	2,600,000
RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs	381,000	0	1,323,000	0	20,100,000
Asset Impairments and Accelerated Depreciation | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs					17,700,000
Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,473,000	4,649,000	4,184,000	7,121,000
Severance and Transition Costs | Other Noncurrent Liabilities
Restructuring Cost and Reserve [Line Items]
Severance and other personnel related costs liability and lease obligation liabilities	$ 0	$ 4,400,000	$ 0	$ 4,400,000
Severance and Transition Costs | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs					$ 1,200,000

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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