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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Income Statement [Abstract]        
Net sales $ 89,234 $ 92,149 $ 172,937 $ 179,480
Cost of sales 43,400 44,493 83,929 85,999
Gross profit 45,834 47,656 89,008 93,481
Operating expenses        
Research and development 6,179 6,069 12,381 12,787
Sales and marketing 20,569 20,983 41,128 41,050
General and administrative 8,089 7,973 15,516 15,296
Amortization of intangibles 4,483 4,061 8,898 8,076
Change in fair value of contingent consideration 306 617 661 1,418
Acquisition, restructuring and other items, net 3,913 2,302 6,056 4,966
Medical device excise tax 978 1,076 1,981 2,071
Total operating expenses 44,517 43,081 86,621 85,664
Operating income 1,317 4,575 2,387 7,817
Other (expenses) income        
Interest expense (998) (793) (1,798) (1,592)
Interest income 1 1 2 1
Other expense (1,048) (954) (1,993) (1,979)
Total other expenses, net (2,045) (1,746) (3,789) (3,570)
Income (loss) before income tax expense (benefit) (728) 2,829 (1,402) 4,247
Income tax expense (benefit) (366) 1,491 (283) 2,439
Net income (loss) $ (362) $ 1,338 $ (1,119) $ 1,808
Income (loss) per share        
Basic (in usd per share) $ (0.01) $ 0.04 $ (0.03) $ 0.05
Diluted (in usd per share) $ (0.01) $ 0.04 $ (0.03) $ 0.05
Basic weighted average shares outstanding (in shares) 36,140 35,595 36,051 35,475
Diluted weighted average shares outstanding (in shares) 36,140 36,127 36,051 36,012