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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Employee benefits
Service cost	$ 911	$ 797	$ 2,733	$ 2,392
Interest cost	1,344	2,355	4,032	7,064
Expected return on plan assets	(1,983)	(2,981)	(5,950)	(8,944)
Amortization of prior service cost (credit)	(128)	(125)	(383)	(376)
Amortization of net loss	1,110	1,586	3,330	4,758
Other adjustments	0	125	(572)	375
Net periodic cost	1,254	1,757	3,190	5,269
Other Postretirement Benefits Plan
Employee benefits
Net periodic cost	$ 0	$ 0	$ 0	$ 0

X

- Definition

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

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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