Note 4 - Inventories - Inventories by Category and Impact of Using LIFO Method (Details) - USD ($)	Sep. 28, 2019	Mar. 31, 2019	Sep. 29, 2018
Finished products	$ 547,116,000	$ 454,920,000	$ 640,258,000
In process	27,190,000	42,045,000	46,274,000
Raw materials and supplies	166,098,000	166,060,000	132,318,000
Total	740,404,000	663,025,000	818,850,000
Less excess of FIFO cost over LIFO cost	165,221,000	161,341,000	134,953,000
Total inventories	$ 575,183,000	$ 501,684,000	$ 683,897,000