Note 8 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018
Service Cost	$ 2,283	$ 1,831	$ 6,848	$ 6,716
Interest Cost	2,316	2,362	6,947	6,848
Expected Return on Plan Assets	(3,957)	(3,593)	(11,870)	(10,785)
Amortization of Prior Service Cost	30	30	90	90
Amortization of Net Loss	29	593	87	1,198
Net Periodic Benefit Cost	$ 701	$ 1,223	$ 2,102	$ 4,067