Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net sales	$ 46,991	$ 46,662
Cost of sales	22,512	22,232
Gross profit	24,479	24,430
Operating expenses:
Sales and marketing	10,274	10,099
Research and development	7,417	8,232
General and administrative	5,116	5,047
Restructuring	0	236
Total operating expenses	22,807	23,614
Operating income	1,672	816
Other income (expense), net:
Interest income	52	72
Other income, net	124	147
Total other income, net	176	219
Income before income taxes	1,848	1,035
Income tax (benefit) provision	618	311
Net income	$ 1,230	$ 724
Net income per common share:
Basic	$ 0.05	$ 0.03
Diluted	$ 0.05	$ 0.03
Weighted average common shares:
Basic	26,188	25,639
Diluted	26,434	26,143