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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Aug. 29, 2021
Aug. 30, 2020
Income Statement [Abstract]    
Product sales $ 128,788 $ 135,643
Cost of product sales 111,269 119,296
Gross profit 17,519 16,347
Operating costs and expenses:    
Research and development 2,826 2,508
Selling, general and administrative 15,939 17,903
Restructuring costs 2,562 8,404
Total operating costs and expenses 21,327 28,815
Operating loss (3,808) (12,468)
Dividend income 0 281
Interest income 27 8
Interest expense (7,917) (3,109)
Other income (expense), net 109 (21)
Net loss before tax (11,589) (15,309)
Income tax benefit 2,112 4,309
Net loss $ (9,477) $ (11,000)
Net loss per common share:    
Net loss per common share - basic (in dollars per share) $ (0.32) $ (0.38)
Net loss per common share - diluted (in dollars per share) $ (0.32) $ (0.38)
Shares used in per share computation:    
Basic (in shares) 29,424 29,242
Diluted (in shares) 29,424 29,242
Other comprehensive income (loss), net of tax:    
Net unrealized gain (losses) on interest rate swaps (net of tax effect of $(90) and $(121)) $ 366 $ 304
Other comprehensive income, net 366 304
Total comprehensive loss $ (9,111) $ (10,696)