Note 3 - Revenue Recognition - Segment Revenue Disaggregated by Product Category Groups (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Net sales	$ 372,256	$ 390,294	$ 607,298	$ 678,459
Canned Vegetables [Member]
Net sales	299,588	302,291	487,532	523,309
Frozen [Member]
Net sales	40,850	31,023	63,434	48,856
Fruit [Member]
Net sales	22,286	23,953	38,159	42,814
Snack [Member]
Net sales	3,685	3,052	7,097	5,416
Prepared Foods [Member]
Net sales	0	24,146	0	48,370
Manufactured Product, Other [Member]
Net sales	$ 5,847	$ 5,829	$ 11,076	$ 9,694