Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 29, 2018	Dec. 29, 2018	Mar. 27, 2021	Mar. 28, 2020	Mar. 30, 2019
Retirement Benefits [Abstract]
U.K. pension settlement loss		$ 13,800	$ 0	$ 0	$ 13,768
Tax benefit	$ 2,600
Employee matching contribution			$ 7,900	$ 7,500	$ 7,700