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Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
Consolidated Statements of Income [Abstract]        
Net sales $ 87,007 $ 58,099 $ 170,423 $ 112,530
Cost of sales 42,919 24,868 86,877 47,154
Gross profit 44,088 33,231 83,546 65,376
Operating expenses        
Research and development 7,014 5,125 14,088 10,715
Sales and marketing 18,671 15,847 37,214 32,156
General and administrative 6,910 4,625 13,808 8,937
Amortization of intangibles 4,107 2,300 7,844 4,594
Acquisition, restructuring and other items, net 2,264 1,408 4,786 2,331
Total operating expenses 38,966 29,305 77,740 58,733
Operating income 5,122 3,926 5,806 6,643
Other income (expenses)        
Interest income 21 260 103 495
Interest expense (1,383) (111) (2,715) (227)
Other expense (628) (506) (1,216) (1,239)
Total other income (expenses) (1,990) (357) (3,828) (971)
Income before income tax provision 3,132 3,569 1,978 5,672
Income tax provision 1,163 1,240 730 1,970
Net income $ 1,969 $ 2,329 $ 1,248 $ 3,702
Earnings per share        
Basic $ 0.06 $ 0.09 $ 0.04 $ 0.15
Diluted $ 0.06 $ 0.09 $ 0.04 $ 0.15
Basic weighted average shares outstanding 34,827 25,190 34,765 25,107
Diluted weighted average shares outstanding 35,311 25,340 35,279 25,278