EMPLOYEE BENEFITS - Reconciliations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 29, 2019	Dec. 30, 2018
Amounts recognized in the statement of financial position consist of:
Noncurrent liability			$ (526,010)	$ (655,310)
Pension plan
Change in Benefit Obligation
Benefit obligation, beginning of year	$ 1,920,987	$ 2,080,013
Interest cost	79,309	79,154
Actuarial (gain)/loss	181,506	(126,540)
Gross benefits paid	(149,859)	(111,640)
Special termination benefits	6,835
Benefit obligation, end of year	2,038,778	1,920,987
Changes in the fair value of the plan's Level 3 investment assets
Fair value of plan assets, beginning of year	1,259,979	1,477,926
Actual return on plan assets	271,332	(115,192)
Employer contribution	11,815	8,885
Gross benefits paid	(149,859)	(111,640)
Fair value of plan assets, end of year	1,393,267	1,259,979
Funded Status
Fair value of plan assets	1,393,267	1,259,979	1,393,267	1,259,979
Benefit obligations	(2,038,778)	(1,920,987)	(2,038,778)	(1,920,987)
Funded status and amount recognized, end of year			(645,511)	(661,008)
Amounts recognized in the statement of financial position consist of:
Current liability			(124,200)	(11,510)
Noncurrent liability			(521,311)	(649,498)
Amounts recognized in the statement of financial position			(645,511)	(661,008)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss/(gain)			781,063	811,063
Amounts recognized in accumulated other comprehensive income			781,063	811,063
Supplemental retirement plans
Changes in the fair value of the plan's Level 3 investment assets
Employer contribution	8,800	8,900
Post-retirement plans
Change in Benefit Obligation
Benefit obligation, beginning of year	6,827	7,625
Interest cost	262	256
Plan participants' contributions	7	10
Actuarial (gain)/loss	(1,020)	(417)
Gross benefits paid	(584)	(647)
Benefit obligation, end of year	5,492	6,827
Changes in the fair value of the plan's Level 3 investment assets
Employer contribution	577	637
Plan participants' contributions	7	10
Gross benefits paid	(584)	(647)
Funded Status
Benefit obligations	$ (5,492)	$ (6,827)	(5,492)	(6,827)
Funded status and amount recognized, end of year			(5,492)	(6,827)
Amounts recognized in the statement of financial position consist of:
Current liability			(793)	(1,015)
Noncurrent liability			(4,699)	(5,812)
Amounts recognized in the statement of financial position			(5,492)	(6,827)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss/(gain)			(7,464)	(7,334)
Prior service cost/(credit)			(2,482)	(4,456)
Amounts recognized in accumulated other comprehensive income			$ (9,946)	$ (11,790)