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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 24, 2019
Feb. 25, 2018
Feb. 24, 2019
Feb. 25, 2018
Income Statement [Abstract]        
Product sales $ 155,687 $ 144,909 $ 405,267 $ 383,151
Cost of product sales 134,470 125,103 351,120 329,622
Gross profit 21,217 19,806 54,147 53,529
Operating costs and expenses:        
Research and development 2,741 3,113 8,107 9,204
Selling, general and administrative 15,843 13,208 44,460 38,810
Total operating costs and expenses 18,584 16,321 52,567 48,014
Operating income 2,633 3,485 1,580 5,515
Dividend income 413 413 1,238 1,238
Interest income 34 87 113 160
Interest expense (1,771) (531) (3,275) (1,415)
Other income 0 0 1,600 2,200
Net income from continuing operations before tax 1,309 3,454 1,256 7,698
Income tax (expense) benefit (242) 12,827 (584) 11,352
Net income from continuing operations 1,067 16,281 672 19,050
Discontinued operations:        
Loss from discontinued operations 0 (277) 0 (339)
Income tax benefit 0 82 0 100
Loss from discontinued operations, net of tax 0 (195) 0 (239)
Consolidated net income 1,067 16,086 672 18,811
Non-controlling interest benefit (expense) 0 2 0 (90)
Net income applicable to common stockholders $ 1,067 $ 16,088 $ 672 $ 18,721
Basic net income per share:        
Income from continuing operations (in dollars per share) $ 0.04 $ 0.59 $ 0.02 $ 0.69
Loss from discontinued operations (in dollars per share) 0.00 (0.01) 0.00 (0.01)
Total basic net income per share (in dollars per share) 0.04 0.58 0.02 0.68
Diluted net income per share        
Income from continuing operations (in dollars per share) 0.04 0.58 0.02 0.68
Loss from discontinued operations (in dollars per share) 0.00 (0.01) 0.00 (0.01)
Total diluted net income per share (in dollars per share) $ 0.04 $ 0.57 $ 0.02 $ 0.67
Shares used in per share computation        
Basic (in shares) 28,919 27,547 28,140 27,524
Diluted (in shares) 29,151 27,918 28,399 27,884
Other comprehensive (loss) income, net of tax:        
Net unrealized (losses) gains on interest rate swaps (net of tax effect of $215, $(210), $190, and $(552)) $ (595) $ 347 $ (608) $ 483
Other comprehensive (loss) income, net of tax (595) 347 (608) 483
Total comprehensive income $ 472 $ 16,435 $ 64 $ 19,204