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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Aug. 25, 2019
Aug. 26, 2018
Income Statement [Abstract]    
Product sales $ 138,714 $ 124,668
Cost of product sales 123,378 108,331
Gross profit 15,336 16,337
Operating costs and expenses:    
Research and development 2,821 2,791
Selling, general and administrative 16,895 13,803
Total operating costs and expenses 19,716 16,594
Operating loss (4,380) (257)
Dividend income 281 413
Interest income 25 46
Interest expense (2,075) (758)
Other income 0 1,000
Net (loss) income from continuing operations before tax (6,149) 444
Income tax benefit (expense) 1,365 (109)
Net (loss) income from continuing operations (4,784) 335
Discontinued operations:    
Loss from discontinued operations 0 (190)
Income tax benefit 0 45
Loss from discontinued operations, net of tax 0 (145)
Net (loss) income applicable to common stockholders $ (4,784) $ 190
Basic net (loss) income per share:    
(Loss) income from continuing operations (in dollars per share) $ (0.16) $ 0.01
Loss from discontinued operations (in dollars per share) 0.00 0.00
Total basic net (loss) income per share (in dollars per share) (0.16) 0.01
Diluted net (loss) income per share    
(Loss) income from continuing operations (in dollars per share) (0.16) 0.01
Loss from discontinued operations (in dollars per share) 0.00 0.00
Total diluted net income per share (in dollars per share) $ (0.16) $ 0.01
Shares used in per share computation    
Basic (in shares) 29,139 27,738
Diluted (in shares) 29,139 28,020
Other comprehensive (loss) income, net of tax:    
Net unrealized losses on interest rate swaps (net of tax effect of $265 and $27) $ (612)  
Net unrealized losses on interest rate swaps (net of tax effect of $265 and $27)   $ (89)
Other comprehensive loss, net of tax (612) (89)
Total comprehensive (loss) income $ (5,396) $ 101