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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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