Note 9 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 28, 2024	Dec. 30, 2023
Service cost including administrative expenses	$ 1,173	$ 1,327	$ 4,354	$ 4,800
Interest cost	3,092	2,914	8,975	8,550
Expected return on plan assets	(5,034)	(4,926)	(13,879)	(13,275)
Amortization of net loss	411	165	563	165
Amortization of prior service cost	2	22	7	60
Net periodic benefit cost	$ (356)	$ (498)	$ 20	$ 300