Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning Balance at Sep. 30, 2009	$ 172,372	$ 874	$ 66,005	$ 1,504	$ 103,989
Beginning Balance, Shares at Sep. 30, 2009		17,471,000
Components of comprehensive income (loss), net of tax:
Net income (loss)	(21,089)				(21,089)
Unrealized holding gains (losses) on available-for-sale securities arising during the period	(437)			(437)
Reclassification for gains included in net income (loss), net of tax provision	(181)			(181)
Comprehensive income (loss)	(21,707)
Issuance of common stock, Shares		40,000
Issuance of common stock	610	2	608
Common stock repurchased, Shares		(102,000)
Common stock repurchased	(2,032)	(6)	(2,026)
Common stock options exercised, Shares	20,350	14,000
Common stock options exercised, net	282	1	281
Purchase of common stock to pay employee taxes, Shares		1,000
Purchase of common stock to pay employee taxes	(545)		(545)
(Reduction or adjustment) Excess of tax benefit from stock-based compensation plans	(496)		(496)
Stock-based compensation	5,875		5,875
Ending Balance at Sep. 30, 2010	154,359	871	69,702	886	82,900
Ending Balance, Shares at Sep. 30, 2010		17,424,000
Components of comprehensive income (loss), net of tax:
Net income (loss)	(18,506)				(18,506)
Unrealized holding gains (losses) on available-for-sale securities arising during the period	(804)			(804)
Reclassification for gains included in net income (loss), net of tax provision	(235)			(235)
Comprehensive income (loss)	(19,545)
Issuance of common stock, Shares		55,000
Issuance of common stock	574	3	571
Common stock repurchased, Shares	0
Common stock options exercised, Shares
Purchase of common stock to pay employee taxes, Shares		52,000
Purchase of common stock to pay employee taxes	(40)	3	(43)
(Reduction or adjustment) Excess of tax benefit from stock-based compensation plans	8		8
Stock-based compensation	4,252		4,252
Ending Balance at Sep. 30, 2011	139,608	877	74,490	(153)	64,394
Ending Balance, Shares at Sep. 30, 2011		17,531,000
Components of comprehensive income (loss), net of tax:
Net income (loss)	10,231				10,231
Unrealized holding gains (losses) on available-for-sale securities arising during the period	335			335
Reclassification for gains included in net income (loss), net of tax provision	(142)			(142)
Comprehensive income (loss)	10,424
Issuance of common stock, Shares		26,000
Issuance of common stock	271	1	270
Common stock repurchased, Shares	(2,894,253)	(2,894,000)
Common stock repurchased	(54,991)	(145)	(54,846)
Common stock options exercised, Shares	11,379	10,000
Common stock options exercised, net	73	1	72
Purchase of common stock to pay employee taxes, Shares		(16,000)
Purchase of common stock to pay employee taxes	(236)	(1)	(235)
(Reduction or adjustment) Excess of tax benefit from stock-based compensation plans	(4,138)		(4,138)
Stock-based compensation	2,733		2,733
Ending Balance at Sep. 30, 2012	$ 93,744	$ 733	$ 18,346	$ 40	$ 74,625
Ending Balance, Shares at Sep. 30, 2012		14,657,000