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Common Stock, Options, and Stock Compensation (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Number of Classes 2  
Common Stock, Conversion Basis, Ratio 1  
Stock Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
Options contractual life 10 years  
Options outstanding, strike price $ 2.95  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average grant date fair value outstanding at end of year $ 19.06 $ 18.47
Shares withheld to satisfy related federal income tax withholding 188,000  
Fair value of RSAs to be amortized $ 18.0  
Weighted average period over which costs amortized 2 years  
Common Stock Class B Voting [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Number of Votes 1  
Common Class A [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Number of Votes 0  
2010 Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Available for grant, shares 421,187  
2010 Plan [Member] | Common Class A [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted stock awards authorized 1,575,750  
Non-employee directors [Member] | Restricted Stock Awards and Non-qualified Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 2 years  
Percent of awards vesting on first anniversary of grant date 50.00%  
Percent of awards vesting on second anniversary of grant date 50.00%