Equity Securities and Stock-Based Compensation (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Treasury stock and related deferred compensation obligation at fair value	$ 1,300,000		$ 1,300,000
Amount that the fair values of treasury stock and related deferred compensation obligation exceed the carrying values at cost	600,000		600,000
Stock-based compensation	700,000	500,000	1,339,000	1,016,000
Total compensation cost related to unvested awards not yet recognized	$ 3,700,000		$ 3,700,000
2010 Incentive Compensation Plan
Board approved share-based award grants to officers, employees, and directors (in shares)					0.3
Awards granted vesting period					3 years
Period of average stock price hurdles that precluded vesting					60 days