CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	May 29, 2022	May 30, 2021	May 31, 2020
Income Statement [Abstract]
Product sales	$ 185,786	$ 171,546	$ 160,066
Cost of product sales	135,416	121,075	120,679
Gross profit	50,370	50,471	39,387
Operating costs and expenses:
Research and development	7,841	7,423	7,582
Selling, general and administrative	46,127	37,660	40,674
Impairment of goodwill and long-lived and indefinite-lived assets	46,089	0	12,953
Legal settlement charge	0	1,763	0
Restructuring costs	8,961	3,759	4,054
Total operating costs and expenses	109,018	50,605	65,263
Operating loss	(58,648)	(134)	(25,876)
Interest income	81	48	72
Interest expense, net	(17,357)	(10,387)	(4,646)
Transition services income	5,814	0	0
Loss on debt refinancing	0	(1,110)	0
Other income (expense), net	641	111	(195)
Net loss from continuing operations before taxes	(69,469)	(11,472)	(30,645)
Income tax benefit	5,945	1,903	8,774
Net loss from continuing operations	(63,524)	(9,569)	(21,871)
Discontinued operations:
Loss from discontinued operations	(51,276)	(28,994)	(20,662)
Income tax benefit	121	5,898	4,342
Loss from discontinued operations, net of tax	(51,155)	(23,096)	(16,320)
Net loss	$ (114,679)	$ (32,665)	$ (38,191)
Basic net loss per share:
Loss from continuing operations (in dollars per share)	$ (2.16)	$ (0.33)	$ (0.75)
Loss from discontinued operations (in dollars per share)	(1.74)	(0.79)	(0.56)
Total basic net loss per share (in dollars per share)	(3.90)	(1.12)	(1.31)
Diluted net loss per share:
Loss from continuing operations (in dollars per share)	(2.16)	(0.33)	(0.75)
Loss from discontinued operations (in dollars per share)	(1.74)	(0.79)	(0.56)
Total diluted net loss per share (in dollars per share)	$ (3.90)	$ (1.12)	$ (1.31)
Shares used in per share computation:
Basic (in shares)	29,466	29,294	29,162
Diluted (in shares)	29,466	29,294	29,162
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Product [Member]	Product [Member]	Product [Member]
Cost, Product and Service [Extensible Enumeration]	Product [Member]	Product [Member]	Product [Member]