Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Net sales	$ 258,911	$ 213,648	$ 204,887
Cost of goods sold	139,553	132,472	119,837
Gross profit	119,358	81,176	85,050
Operating expenses:
Selling and marketing	60,330	34,666	33,611
General and administrative	27,017	22,300	17,883
Research and development	5,114	4,017	4,746
Amortization of intangibles	1,435	0	0
Total operating expenses	93,896	60,983	56,240
Income from operations	25,462	20,193	28,810
Other income (expense):
Interest income	56	166	174
Interest expense	(2,795)	(424)	(350)
Other, net	78	(45)	8
Total other expense, net	(2,661)	(303)	(168)
Income before income taxes	22,801	19,890	28,642
Income tax expense	9,074	7,248	10,196
Net income	$ 13,727	$ 12,642	$ 18,446
Weighted average shares outstanding:
Basic (in shares)	29,296,261	28,986,227	28,360,184
Diluted (in shares)	29,446,635	29,252,030	28,928,162
Net income per share:
Basic (in dollars per share)	$ 0.47	$ 0.44	$ 0.65
Diluted (in dollars per share)	$ 0.47	$ 0.43	$ 0.64