Stock-based Compensation (Details) (USD $)	3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			9 Months Ended	3 Months Ended	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Stock Options [Member]	Jun. 30, 2014 SSARs / Stock Options [Member]	Jun. 30, 2014 SSARs / Stock Options [Member]	Jun. 30, 2014 Nonvested Stock Awards [Member]	Sep. 30, 2013 Nonvested Stock Awards [Member]	Jun. 30, 2014 Performance Shares [Member]	Jun. 30, 2014 Nonvested Stock Awards and Performance Shares [Member]	Jun. 30, 2014 Nonvested Stock Awards and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation included in general and administrative expenses	$ 600,000	$ 1,900,000
Total stock-based compensation included in general and administrative expenses, net of tax	500,000	1,400,000
Number of shares surrendered by employees (shares)		23,602	6,147
Stock Surrendered During Period, Value		450,000	121,000
Intrinsic value of SSAR/stock options outstanding					2,700,000	2,700,000
Aggregate intrinsic value of SSARs/stock options vested and expected to vest					2,700,000	2,700,000
SSARs/stock options weighted average expected life						2 years 9 months 7 days
Unrecognized compensation costs related to non-vested stock awards							2,800,000	1,000,000
Weighted average period to recognize remaining cost							2 years 4 months 24 days
Number of shares of performance-based restricted stock issued (shares)									28,690
Non-vested stock performance period (years)									3 years
Increase in target number of Performance Shares (percent)									50.00%
Expected dividend yield on performance shares (percent)									0.00%
Expected volatility rate range minimum (percent)									35.00%
Expected volatility rate range maximum (percent)									59.10%
Aggregate intrinsic value of exercisable SSARs/stock options					1,200,000	1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions [Abstract]
Expected life of options				5 years 26 days
Expected volatility				45.99%
Expected discrete dividends				$ 0
Weighted average risk-free interest rate (percent)				1.42%					0.66%
Weighted average fair value (in US$ per share)				$ 7.97
Share-based Compensation Arrangement by Share-based Payment Award, Outstanding [Roll Forward]
Shares outstanding at beginning of period (shares)					711,869	560,784
Granted (shares)					0	161,010				50,000	185,567
Exercised (shares)					0	(1,288)
Expired (shares)					(52,941)	(55,811)
Forfeited (shares)					0	(5,767)
Shares outstanding at end of period (shares)					658,928	658,928
Exercisable at end of period (shares)					358,723	358,723
Vested or expected to vest in the future (shares)					653,999	653,999
Share-based Compensation Arrangement by Share-based Payment Award, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price of shares outstanding at beginning of period (in US$ per share)					$ 29.41	$ 33.01
Weighted average exercise price of shares granted (in US$ per share)					$ 0.00	$ 19.11
Weighted average exercise price of shares exercised (in US$ per share)					$ 0.00	$ 16.16
Weighted average exercise price of shares expired (in US$ per share)					$ 170.00	$ 170.32
Weighted average exercise price of shares forfeited (in US$ per share)					$ 0.00	$ 22.23
Weighted average exercise price of shares outstanding at beginning of period (in US$ per share)					$ 18.11	$ 18.11
Weighted average exercise price of shares exercisable at end of period (in US$ per share)					$ 19.73	$ 19.73
Weighted average exercise price of shares vested or expected to vest in the future (in US$ per share)					$ 18.11	$ 18.11
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares outstanding at beginning of period (shares)										306,456	280,416
Granted (shares)					0	161,010				50,000	185,567
Shares vested (shares)										(10,322)	(112,599)
Shares forfeited (shares)										(1,342)	(8,592)
Shares outstanding at end of period (shares)										344,792	344,792
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant date fair value of shares outstanding at beginning of period (in US$ per share)										$ 13.08	$ 12.32
Weighted average grant date fair value of shares granted (in US$ per share)									$ 15.90	$ 20.25	$ 18.27
Weighted average grant date fair value of shares vested in period (in US$ per share)										$ 70.26	$ 21.56
Weighted average grant date fair value of shares forfeited in period (in US$ per share)										$ 19.11	$ 16.86
Weighted average grant date fair value of shares outstanding at end of period (in US$ per share)										$ 12.39	$ 12.39