Equity Securities and Stock-Based Compensation (Details) (USD $)	1 Months Ended	12 Months Ended			1 Months Ended
	Feb. 29, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Nov. 30, 2012 Subsequent Event
Equity Securities and Stock-Based Compensation
Common stock, authorized shares		200,000,000	200,000,000	100,000,000
Preferred stock, shares authorized		10,000,000
Treasury stock and related deferred compensation obligation at fair value		$ 200,000
Carrying value of treasury stock and related deferred compensation obligation at cost		200,000
Amount available for future offerings of securities	210,000,000
Shares authorized for grant from existing plans approved by board		1,200,000	900,000	1,100,000
Contractual term		10 years
Stock-based compensation		1,737,000	3,658,000	5,015,000
Total income tax benefit recognized for stock-based compensation		$ 0	$ 0	$ 1,800,000
Subsequent Event
Stock-based awards to officers and employees (in shares)					500,000