Annual report pursuant to Section 13 and 15(d)

RETIREMENT AND SAVINGS BENEFIT PLANS - Components of Pension Cost (Details)

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RETIREMENT AND SAVINGS BENEFIT PLANS - Components of Pension Cost (Details) - Pension Plan - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 30, 2019
Dec. 30, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Service cost — benefits earned during the period $ 5,912 $ 22,352 $ 24,890 $ 25,839
Interest cost on projected benefit obligations 14,825 63,434 58,989 68,020
Expected return on plan assets (25,314) (93,409) (94,807) (99,540)
Settlement charges 0 8,856 0 50,922
Curtailments 0 9,530 1,671 0
Amortization of deferred amounts, Net deferred actuarial losses 8,548 28,474 41,440 65,212
Amortization of deferred amounts, Deferred prior service costs 647 494 2,646 2,584
Total pension expense $ 4,618 $ 39,731 $ 34,829 $ 113,037
Weighted average actuarial assumptions used to determine pension expense:        
Discount rate in effect for determining service cost 3.58% 3.85% 4.08% 4.54%
Discount rate in effect for determining interest cost 3.13% 3.51% 3.26% 3.56%
Expected long-term return on plan assets 5.72% 5.58% 5.72% 5.81%
Rate of compensation increase 3.73% 3.73% 3.78% 3.90%