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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2009
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 1996
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2012
Apr. 30, 2007
Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unamortized Expense Share Issuance   $ 0.1         $ 0.1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                  
Beginning Outstanding (in shares)   35,203 69,154 127,975          
Awarded (in shares)   0 0 0          
Released (in shares)   (21,663) (33,951) (58,771)          
Forfeited (in shares)   0 0 (50)          
Ending Outstanding (in shares)   13,540 35,203 69,154          
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)   $ 7.98 $ 10.13 $ 10.13   $ 10.13   $ 9.06  
Awarded, Weighted Average Grant Date Fair Value (usd per share)   0.00 0.00 0.00          
Released, Weighted Average Grant Date Fair Value (usd per share)   11.47 10.13 7.81          
Forfeited, Weighted Average Grant Date Fair Value (usd per share)   0.00 0.00 7.98          
Ending Outstanding, Weighted Average Grant Date Fair Value (usd per share)   $ 7.98 $ 10.13 $ 10.13   $ 10.13   $ 9.06  
Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available to grant   1,083,638              
Expiration period   10 years              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                  
Shares Available   1,083,638              
Options Outstanding   1,627,477 1,063,324 1,059,567       891,293  
2007 Employee Stock Incentive Plan | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available to grant   916,038             500,000
Number of additional shares authorized 2,500,000                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                  
Shares Authorized   3,000,000              
Shares Available   916,038             500,000
Options Outstanding   1,425,297              
1998 Employee Stock Option Plan | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available to grant   0              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                  
Shares Authorized   500,000              
Shares Available   0              
Options Outstanding   23,710              
Non-Employee Directors Stock Option Plan | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available to grant   167,600              
Number of additional shares authorized 400,000                
Share-based compensation, shares issued         100,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                  
Shares Authorized   500,000              
Shares Available   167,600              
Options Outstanding   178,470              
Maximum | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Option vesting period (in years)   4 years              
Maximum | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expiration period   10 years              
Option vesting period (in years)   4 years              
Minimum | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Option vesting period (in years)   2 years              
Minimum | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Option vesting period (in years)   2 years