Quarterly report pursuant to Section 13 or 15(d)

PENSION PLANS - Components of Pension Cost (Details)

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PENSION PLANS - Components of Pension Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 29, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Retirement Benefits [Abstract]          
Service cost – benefits earned during the period $ 5,561   $ 6,202 $ 11,785 $ 12,317
Interest cost on projected benefit obligations 15,818   14,730 31,831 29,439
Expected return on plan assets (23,197)   (23,825) (47,031) (47,622)
Pension settlement charges 1,342   0 8,184 0
Pension curtailment losses 0 $ 9,500 0 9,483 0
Amortization of deferred amounts:          
Net deferred actuarial losses 6,655   10,030 15,477 20,032
Deferred prior service costs (credits) (59)   643 610 1,288
Net periodic pension cost $ 6,120   $ 7,780 $ 30,339 $ 15,454