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Note 5 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 27, 2026	Mar. 31, 2026	Jun. 28, 2025
Property, Plant and Equipment, Gross	$ 881,677	$ 862,455	$ 835,493
Less: accumulated depreciation	(540,906)	(531,175)	(510,001)
Property, plant and equipment, net	340,771	331,280	325,492
Land and Land Improvements [Member]
Property, Plant and Equipment, Gross	57,026	54,195	53,458
Building and Building Improvements [Member]
Property, Plant and Equipment, Gross	243,377	243,062	238,848
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	527,445	523,448	506,101
Office Furniture, Vehicles and Computer Software [Member]
Property, Plant and Equipment, Gross	18,375	17,420	15,948
Construction in Progress [Member]
Property, Plant and Equipment, Gross	$ 35,454	$ 24,330	$ 21,138

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