Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

v3.5.0.2
Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended 84 Months Ended 120 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 1996
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2013
Apr. 30, 2007
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unamortized expense $ 0.1              
Restricted Stock, Amount [Roll Forward]                
Beginning Outstanding (in shares) 13,540 35,203 69,154          
Released (in shares) (13,540) (21,663) (33,951)          
Ending Outstanding (in shares) 0 13,540 35,203          
Restricted Stock, Weighted Average Grant Date Fair Value [Roll Forward]                
Beginning Outstanding (usd per share) $ 0.00 $ 7.98 $ 10.13       $ 10.13  
Released (usd per share) 7.98 11.47 10.13          
Ending Outstanding (usd per share) $ 0.00 $ 7.98 $ 10.13       $ 10.13  
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available to grant 853,702              
Expiration period 10 years              
Restricted Stock, Weighted Average Grant Date Fair Value [Roll Forward]                
Shares Available 853,702              
Options Outstanding 1,841,567 1,627,477 1,063,324       1,059,567  
2007 Employee Stock Incentive Plan | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available to grant 722,102             500,000
Number of additional shares authorized         2,500,000      
Restricted Stock, Weighted Average Grant Date Fair Value [Roll Forward]                
Shares Authorized 3,000,000              
Shares Available 722,102             500,000
Options Outstanding 1,603,887              
1998 Employee Stock Option Plan | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available to grant 0              
Restricted Stock, Weighted Average Grant Date Fair Value [Roll Forward]                
Shares Authorized 500,000              
Shares Available 0              
Options Outstanding 23,210              
Non-Employee Directors Stock Option Plan | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available to grant 131,600              
Number of additional shares authorized           400,000    
Share-based compensation, shares issued       100,000        
Restricted Stock, Weighted Average Grant Date Fair Value [Roll Forward]                
Shares Authorized 500,000              
Shares Available 131,600              
Options Outstanding 214,470              
Minimum | Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Option vesting period 6 months              
Minimum | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Option vesting period 6 months              
Maximum | Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Option vesting period 4 years              
Maximum | Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expiration period 10 years              
Option vesting period 4 years