Postretirement Benefit Plans (Schedule of Net Periodic Pension Expense) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 29, 2018	Mar. 30, 2019	Mar. 31, 2018	Mar. 25, 2017
Defined Benefit Plan Disclosure [Line Items]
Interest cost		$ 0	$ 651
Settlement loss	$ 13,800	13,768	0	$ 0
Research and development
Defined Benefit Plan Disclosure [Line Items]
Expenses		0	0	0
Interest cost		0	651	759
Expected return on plan assets		0	(1,159)	(1,126)
Settlement loss		0	0	1,063
Amortization of actuarial gain		0	0	(89)
Net periodic pension expense (income)		$ 0	$ (508)	$ 607