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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Income Statement [Abstract]      
Net sales $ 353,890 $ 356,534 $ 354,425
Cost of sales 179,574 180,738 174,251
Gross profit 174,316 175,796 180,174
Operating expenses      
Research and development 25,053 26,594 28,124
Sales and marketing 84,723 83,220 85,305
General and administrative 29,603 29,162 26,902
Amortization of intangibles 17,964 17,966 16,562
Change in fair value of contingent consideration 948 (8,096) (1,908)
Acquisition, restructuring and other items, net 12,591 26,257 10,873
Medical device excise tax 2,416 4,142 3,829
Total operating expenses 173,298 179,245 169,687
Operating income (loss) 1,018 (3,449) 10,487
Other (expenses) income      
Interest income 11 4 0
Interest expense (3,396) (3,197) (3,656)
Other expense (886) (1,489) (1,645)
Total other expenses, net (4,271) (4,682) (5,301)
Income (loss) before income tax expense (benefit) (3,253) (8,131) 5,186
Income tax expense (benefit) 40,337 (4,743) 2,839
Net income (loss) $ (43,590) $ (3,388) $ 2,347
Earnings per share      
Basic (usd per share) $ (1.21) $ (0.09) $ 0.07
Diluted (usd per share) $ (1.21) $ (0.09) $ 0.07
Basic weighted average shares outstanding (in shares) 36,161,383 35,683,139 35,135,689
Diluted weighted average shares outstanding (in shares) 36,161,383 35,683,139 35,439,850