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EMPLOYEE BENEFIT PLANS - Components of Net Period Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Retirement Benefits [Abstract]
Service cost	$ 3,609	$ 2,833	$ 2,612
Interest cost	8,849	11,583	10,850
Expected return on plan assets	(11,348)	(13,005)	(15,516)
Amortization of prior service credit	(489)	(489)	(514)
Amortization of net loss	6,239	2,250	2,990
Other	417	850	910
Net periodic benefit cost	7,277	4,022	1,332
Settlement	12,385	0	0
Total benefit cost	$ 19,662	$ 4,022	$ 1,332

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