Note 9 - Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Service cost including administrative expenses	$ 1,323	$ 1,590	$ 2,645	$ 3,181
Interest cost	2,912	2,941	5,825	5,883
Expected return on plan assets	(4,818)	(4,422)	(9,637)	(8,845)
Amortization of net loss	0	76	0	152
Amortization of prior service cost	0	3	0	5
Amortization of net loss	$ (583)	$ 188	$ (1,167)	$ 376