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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Dec. 28, 2019
Amounts recognized in accumulated other comprehensive income (loss)    
Net actuarial loss $ 82,914 $ 116,930
Net prior service cost (credit) (1,593) (2,096)
Net amount recognized $ 81,321 $ 114,834