Note 4 - Inventories - Inventories by Category and Impact of Using LIFO Method (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Finished products	$ 912,430	$ 613,622	$ 738,331
In process	111,939	75,123	67,380
Raw materials and supplies	266,603	284,593	218,572
FIFO Inventory Amount	1,290,972	973,338	1,024,283
Less excess of FIFO cost over LIFO cost	322,083	302,440	250,162
Total inventories	$ 968,889	$ 670,898	$ 774,121