Condensed Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Net sales	$ 85,133	$ 58,238
Cost of goods sold	45,066	32,196
Gross profit	40,067	26,042
Operating expenses:
Selling and marketing	19,108	11,731
General and administrative	6,340	4,968
Research and development	1,260	1,296
Amortization of intangibles	1,022	294
Total operating expenses	27,730	18,289
Income from operations	12,337	7,753
Other income (expense):
Interest income	8	18
Interest expense	(2,709)	(370)
Other, net	(21)	1
Total other expense, net	(2,722)	(351)
Income before income taxes	9,615	7,402
Income tax expense	3,586	2,699
Net income	6,029	4,703
Comprehensive income	$ 5,984	$ 4,691
Weighted average shares outstanding:
Basic (in shares)	29,355,593	29,325,496
Diluted (in shares)	29,933,470	29,456,948
Net income per share - Class A and B common stock and vested restricted stock units:
Basic (in dollars per share)	$ 0.21	$ 0.16
Diluted (in dollars per share)	$ 0.20	$ 0.16