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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Stock Option Plans
Defined Benefit Plan Disclosure [Line Items]
Shares of common stock available for issuance (in shares)	1,187,679		1,187,679
Expiration period for grant			7 years
Compensation expense	$ 2,346	$ 2,700	$ 5,671	$ 6,370
Income tax benefits	$ 587	$ 675	$ 1,418	$ 1,593
Stock Option Plans \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Vesting period of options			3 years
Stock Option Plans \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Vesting period of options			6 years
Restricted Stock Units (RSUs)
Defined Benefit Plan Disclosure [Line Items]
Vesting period of options			3 years