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
Dec. 28, 2019
Mar. 31, 2018
Mar. 28, 2020
Mar. 30, 2019
Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]          
Service cost — benefits earned during the period   $ 5,912 $ 14,476 $ 22,352 $ 24,890
Interest cost on projected benefit obligations   14,825 55,575 63,434 58,989
Expected return on plan assets   (25,314) (91,309) (93,409) (94,807)
Settlement charges $ (22,900) 0 27,443 8,856 0
Curtailments   0 0 9,530 1,671
Transfers to Kontoor Brands   0 668 0 0
Amortization of deferred amounts, Net deferred actuarial losses   8,548 14,848 28,474 41,440
Amortization of deferred amounts, Deferred prior service costs   647 1,887 494 2,646
Total pension expense   $ 4,618 $ 23,588 $ 39,731 $ 34,829
Weighted average actuarial assumptions used to determine pension expense:          
Discount rate in effect for determining service cost   3.58% 1.46% 3.85% 4.08%
Discount rate in effect for determining interest cost   3.13% 3.20% 3.51% 3.26%
Expected long-term return on plan assets   5.72% 5.40% 5.58% 5.72%
Rate of compensation increase (a)   3.73% 2.74% 3.73% 3.78%