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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Income Statement [Abstract]      
Net sales $ 354,455 $ 342,026 $ 221,787
Cost of sales 174,594 173,037 95,829
Gross profit 179,861 168,989 125,958
Operating expenses      
Research and development 27,510 26,319 20,511
Sales and marketing 83,200 76,121 64,505
General and administrative 26,035 26,127 18,334
Amortization of intangibles 16,797 16,345 9,406
Change in fair value of contingent consideration (1,718) 1,583 0
Acquisition, restructuring and other items, net 10,760 13,800 16,164
Medical device excise tax 3,829 1,600 0
Total operating expenses 166,413 161,895 128,920
Operating income (loss) 13,448 7,094 (2,962)
Other (expenses) income      
Interest income 0 103 1,090
Interest expense (3,656) (5,271) (508)
Other expense (3,412) (2,569) (2,902)
Total other expenses, net (7,068) (7,737) (2,320)
Income (loss) before income tax expense (benefit) 6,380 (643) (5,282)
Income tax expense (benefit) 3,292 (31) (188)
Net income (loss) $ 3,088 $ (612) $ (5,094)
Earnings per share      
Basic (usd per share) $ 0.09 $ (0.02) $ (0.20)
Diluted (usd per share) $ 0.09 $ (0.02) $ (0.20)
Basic weighted average shares outstanding (in shares) 35,135,689 34,817,279 25,382,293
Diluted weighted average shares outstanding (in shares) 35,439,850 34,817,279 25,382,293