Note 8 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Service Cost	$ 1,831	$ 1,981	$ 6,716	$ 5,944
Interest Cost	2,362	1,985	6,848	5,956
Expected Return on Plan Assets	(3,593)	(3,673)	(10,785)	(10,640)
Amortization of Prior Service Cost	30	0	90	0
Amortization of Net Gain	593	30	1,198	90
Net Periodic Benefit Cost	$ 1,223	$ 323	$ 4,067	$ 1,350