Note 9 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 26, 2020	Dec. 28, 2019
Service Cost Including Administration	$ 923	$ 2,283	$ 7,442	$ 6,848
Interest Cost	2,302	2,316	6,907	6,947
Expected Return on Plan Assets	(4,814)	(3,957)	(11,835)	(11,870)
Amortization of Prior Service Cost	22	30	68	90
Amortization of Net Loss	2,257	29	7,317	87
Net Periodic Benefit Cost	$ 690	$ 701	$ 9,899	$ 2,102