Employee Retirement and Profit Sharing Plans (Funded status of plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018
Change in Plan Assets:
Fair value of plan assets at beginning of year	$ 20,838	$ 20,629
Actual (loss) return on plan assets	(1,507)	929
Benefits paid	(720)	(720)
Fair value of plan assets at end of year	18,611	20,838	$ 20,629
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	20,972	20,606
Interest cost	752	781	796
Actuarial loss	642	305
Benefits paid	(720)	(720)
Benefit obligation at end of year	21,646	20,972	$ 20,606
Underfunded status of plan	$ (3,035)	$ (134)