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RETIREMENT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent (in hundredths)	25.00%	25.00%	25.00%
Defined contribution plan, cost recognized	$ 7.2	$ 6.5	$ 3.4
Additonal matching contributions	$ 2.9	2.6
Maximum annual contribution per employee (in hundredths)	6.00%
Number of years of service with the Company	20 years
Number of years of service with the Company as on officer	10 years
Percentage of officer's highest base salary (in hundredths)	150.00%
Years preceding separation from service	3 years
Other Liabilities
Defined Benefit Plan Disclosure [Line Items]
Liabilities related to Plan	$ 11.8	$ 10.6

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Amount of costs for defined contribution plan related to employees meeting certain performance goals.

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The number of years of service with the Company.

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The percentage of the highest base salary for officers of the entity used as a basis for retirement benefits for the officer in the three years immediately preceding separation from service.

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The number of years preceding separation from service the former officer is eligible for 150% of their highest base salary.

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Amount of cost for defined contribution plan.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of liability, recognized in statement of financial position, for defined benefit other postretirement plan, classified as noncurrent. Excludes pension plan.

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