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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Pension Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Net periodic (benefit) expense:
Interest cost	$ 2,530	$ 3,160	$ 5,027	$ 6,284
Expected return on plan assets	(7,097)	(5,664)	(14,102)	(11,262)
Amortization of actuarial loss	843	720	1,675	1,431
Net periodic (benefit) expense	$ (3,724)	$ (1,784)	$ (7,400)	$ (3,547)

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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