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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Income Statement [Abstract]      
Net sales $ 344,285 $ 349,643 $ 353,890
Cost of sales (exclusive of intangible amortization) 167,410 173,474 179,574
Gross profit 176,875 176,169 174,316
Operating expenses      
Research and development 25,459 25,269 25,053
Sales and marketing 77,276 78,819 83,743
General and administrative 31,265 31,406 30,583
Amortization of intangibles 16,635 17,296 17,964
Change in fair value of contingent consideration 250 (15,261) 948
Acquisition, restructuring and other items, net 15,432 27,510 12,591
Medical device excise tax 0 (1,837) 2,416
Total operating expenses 166,317 163,202 173,298
Operating income 10,558 12,967 1,018
Other expenses      
Interest expense, net (3,062) (2,839) (3,385)
Other expense (31) (281) (886)
Total other expenses, net (3,093) (3,120) (4,271)
Income (loss) before income tax expense (benefit) 7,465 9,847 (3,253)
Income tax expense (benefit) (8,870) 4,839 40,337
Net income (loss) $ 16,335 $ 5,008 $ (43,590)
Earnings (loss) per share      
Basic (usd per share) $ 0.44 $ 0.14 $ (1.21)
Diluted (usd per share) $ 0.44 $ 0.14 $ (1.21)
Weighted average shares outstanding      
Basic (in shares) 37,074,797 36,616,859 36,161,383
Diluted (in shares) 37,539,400 36,959,250 36,161,383