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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Aug. 28, 2022
Aug. 29, 2021
Income Statement [Abstract]    
Product sales $ 43,355 $ 41,632
Cost of product sales 37,534 31,197
Gross profit 5,821 10,435
Operating costs and expenses:    
Research and development 2,048 1,873
Selling, general and administrative 10,883 9,470
Restructuring costs 1,047 1,834
Total operating costs and expenses 13,978 13,177
Operating loss (8,157) (2,742)
Interest income 15 27
Interest expense (3,678) (6,678)
Other income (expense), net (180) 109
Net loss before tax (12,000) (9,284)
Income tax (expense) benefit (64) 1,651
Net loss from continuing operations (12,064) (7,633)
Loss from discontinued operations, net of tax 0 (1,844)
Net loss $ (12,064) $ (9,477)
Basic net loss per share:    
Loss from continuing operations - basic (in dollars per share) $ (0.41) $ (0.26)
Loss from discontinued operations- basic (in dollars per share) 0 (0.06)
Total basic net loss per share (in dollars per share) (0.41) (0.32)
Diluted net loss per share:    
Loss from continuing operations - diluted (in dollars per share) (0.41) (0.26)
Loss from discontinued operations- diluted (in dollars per share) 0 (0.06)
Total diluted net loss per share (in dollars per share) $ (0.41) $ (0.32)
Shares used in per share computation:    
Basic (in shares) 29,577 29,424
Diluted (in shares) 29,577 29,424
Other comprehensive income (loss), net of tax:    
Net unrealized gain (losses) on interest rate swaps (net of tax effect of $(16) and $(90)) $ 300 $ 366
Other comprehensive income, net 300 366
Total comprehensive loss $ (11,764) $ (9,111)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] Product [Member] Product [Member]
Cost, Product and Service [Extensible Enumeration] Product [Member] Product [Member]