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Equity Securities and Stock-Based Compensation - SARS and Restricted Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended 36 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2016
Equity Securities and Stock-based Compensation        
Awards granted vesting period 3 years      
Share-based compensation        
Compensation expense related to restricted stock, restricted stock units and the ESPP $ 1.6 $ 1.4 $ 0.9  
Total compensation cost related to unvested awards not yet recognized $ 2.5     $ 2.5
Weighted-average period for recognition of compensation cost 1 year 8 months 12 days      
Restricted stock        
Equity Securities and Stock-based Compensation        
Awards granted vesting period 3 years      
Nonvested shares        
Shares Outstanding, Beginning Balance 126      
Shares, Granted 90      
Shares, Vested (117)      
Shares, Forfeited (1)      
Shares Outstanding, Ending Balance 98 126   98
Nonvested weighted-average grant date fair value        
Beginning Balance $ 11.51      
Granted 17.83      
Vested 12.66      
Forfeited 11.46      
Ending Balance $ 15.98 $ 11.51   $ 15.98
Officers and Employees | Restricted stock        
Nonvested shares        
Shares, Granted       200