CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 28, 2021	Nov. 29, 2020	Nov. 28, 2021	Nov. 29, 2020
Income Statement [Abstract]
Product sales	$ 129,492	$ 130,904	$ 258,280	$ 266,547
Cost of product sales	116,500	110,267	227,769	229,564
Gross profit	12,992	20,637	30,511	36,983
Operating costs and expenses:
Research and development	2,718	2,572	5,544	5,080
Selling, general and administrative	13,835	16,106	29,774	34,009
Impairment of goodwill	32,057	0	32,057	0
Legal settlement charge	0	1,763	0	1,763
Restructuring costs	1,412	1,662	3,974	10,066
Total operating costs and expenses	50,022	22,103	71,349	50,918
Operating loss	(37,030)	(1,466)	(40,838)	(13,935)
Dividend income	0	281	0	563
Interest income	19	10	46	18
Interest expense	(4,333)	(3,039)	(12,250)	(6,148)
Other income (expense), net	79	(11,787)	188	(11,808)
Net loss before tax	(41,265)	(16,001)	(52,854)	(31,310)
Income tax benefit	2,824	2,700	4,936	7,009
Net loss	$ (38,441)	$ (13,301)	$ (47,918)	$ (24,301)
Net loss per common share:
Net loss per common share - basic (in dollars per share)	$ (1.30)	$ (0.45)	$ (1.63)	$ (0.83)
Net loss per common share - diluted (in dollars per share)	$ (1.30)	$ (0.45)	$ (1.63)	$ (0.83)
Shares used in per share computation:
Basic (in shares)	29,471	29,280	29,448	29,261
Diluted (in shares)	29,471	29,280	29,448	29,261
Other comprehensive income (loss), net of tax:
Net unrealized gain (losses) on interest rate swaps (net of tax effect of $(100), $(121), $(190), and $(228))	$ 176	$ 401	$ 542	$ 705
Other comprehensive income, net	176	401	542	705
Total comprehensive loss	$ (38,265)	$ (12,900)	$ (47,376)	$ (23,596)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
Cost, Product and Service [Extensible Enumeration]	Product [Member]	Product [Member]	Product [Member]	Product [Member]