Stock-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified					12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2014 Restricted shares [Member]	Sep. 30, 2013 Restricted shares [Member]	Sep. 30, 2012 Restricted shares [Member]	Sep. 30, 2014 Performance shares [Member]	Sep. 30, 2013 Performance shares [Member]	Sep. 30, 2012 Performance shares [Member]
Summary of activity related to target number of shares awarded and actual number of shares earned
Outstanding at beginning of period, Number of Shares	174	154	158	135
Shares awarded, Number of Shares					26	12	27	112	60	59
Shares earned, Number of Shares					(25)	(5)	(11)	(21)	(33)	(9)
Shares forfeited, Number of Shares								(72)	(38)	(43)
Outstanding at end of period, Number of Shares	174	154	158	135
Outstanding at beginning of period, Weighted Average Fair Value at Date of Grant	$ 24.86	$ 17.85	$ 18.30	$ 13.25
Shares awarded, Weighted Average Fair Value at Date of Grant					$ 25.34	$ 15.50	$ 22.08	$ 26.50	$ 15.98	$ 19.53
Shares earned, Weighted Average Fair Value at Date of Grant					$ 18.94	$ 22.00	$ 16.30	$ 16.42	$ 16.05	$ 5.99
Shares forfeited, Weighted Average Fair Value at Date of Grant								$ 17.12	$ 17.00	$ 9.73
Outstanding at end of period, Weighted Average Fair Value at Date of Grant	$ 24.86	$ 17.85	$ 18.30	$ 13.25