Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended											0 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended			12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Restricted Stock	Sep. 30, 2012 Restricted Stock	Sep. 30, 2011 Restricted Stock	Sep. 30, 2013 Stock Options	Sep. 30, 2012 Stock Options	Sep. 30, 2011 Stock Options	Sep. 30, 2010 Stock Options	Jan. 31, 2008 1998 Employee Stock Option Plan Stock-Based	Jan. 01, 1998 1998 Employee Stock Option Plan Stock-Based	Sep. 30, 2013 1998 Employee Stock Option Plan Stock Options	Jul. 31, 2005 Non-Employee Directors Stock Option Plan Stock-Based	Mar. 31, 2009 Non-Employee Directors Stock Option Plan Stock-Based	Sep. 30, 1996 Non-Employee Directors Stock Option Plan Stock-Based	Sep. 30, 2013 Non-Employee Directors Stock Option Plan Stock Options	Mar. 31, 2009 2007 Employee Stock Incentive Plan Stock-Based	Apr. 01, 2007 2007 Employee Stock Incentive Plan Stock-Based	Sep. 30, 2013 2007 Employee Stock Incentive Plan Stock Options	Sep. 30, 2013 Maximum	Sep. 30, 2013 Maximum Stock-Based	Sep. 30, 2013 Minimum	Sep. 30, 2013 Minimum Stock-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Share-based Compensation, Gross												200,000		100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized													150,000			900,000
Expiration period	10 years																			10 years
Option vesting period (in years)																			4 years	4 years	1 year	1 year
Unamortized Expense Share Issuance		$ 0.4	$ 0.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Outstanding (in shares)		127,975	120,970	128,751
Awarded (in shares)		0	60,600	35,517
Released (in shares)		(58,771)	(51,595)	(43,298)
Forfeited (in shares)		(50)	(2,000)	0
Ending Outstanding (in shares)		69,154	127,975	120,970
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Beginning Outstanding, Weighted Average Grant Date Fair Value (usd per share)		$ 9.06	$ 9.42	$ 6.34
Awarded, Weighted Average Grant Date Fair Value (usd per share)		$ 0.00	$ 7.98	$ 17.28
Released, Weighted Average Grant Date Fair Value (usd per share)		$ 7.81	$ 8.72	$ 6.78
Forfeited, Weighted Average Grant Date Fair Value (usd per share)		$ 7.98	$ 7.22	$ 0.00
Ending Outstanding, Weighted Average Grant Date Fair Value (usd per share)		$ 10.13	$ 9.06	$ 9.42
Shares Authorized											500,000				350,000			1,400,000
Shares Available					259,742				500,000	50,000	0				65,600		500,000	194,142
Options Outstanding					1,059,567	891,293	611,384	636,283			72,710				147,853			839,004