Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Consolidated Statements Of Operations [Abstract]
Sales	$ 172,970	$ 128,533	$ 92,860
Cost of sales	98,857	81,177	66,287
Gross profit	74,113	47,356	26,573
Operating expenses:
Selling, general and administrative expenses	18,051	16,618	14,572
Research and development expenses	11,529	9,925	8,062
Bad debt expense (recovery)	128	(479)	318
Total operating expenses	29,708	26,064	22,952
Loss on disposal of equipment		(184)	(12)
Income from operations	44,405	21,108	3,609
Other income (expense):
Interest expense	(43)	(238)	(602)
Interest income	267	254	809
Foreign exchange gains (losses)	80	(52)	(414)
Other, net	(90)	(170)	(91)
Total other income (expense), net	214	(206)	(298)
Income before income taxes	44,619	20,902	3,311
Income tax expense	14,908	6,820	1,551
Net income	$ 29,711	$ 14,082	$ 1,760
Earnings per common share:
Basic	$ 4.78	$ 2.33	$ 0.30
Diluted	$ 4.73	$ 2.27	$ 0.29
Weighted average common shares outstanding:
Basic	6,220,657	6,031,314	5,950,403
Diluted	6,286,324	6,193,018	6,079,378