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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Stock Option Plans
Defined Benefit Plan Disclosure [Line Items]
Shares of common stock available for issuance (in shares)	1,189,407		1,189,407
Expiration period for grant			7 years
Compensation expense	$ 3,065	$ 2,519	$ 8,736	$ 8,889
Income tax benefits	$ 766	$ 630	$ 2,184	$ 2,222
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