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Capital Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2014
item
Sep. 30, 2013
item
Sep. 30, 2012
Sep. 30, 2013
1998 Stock Incentive Plan
Sep. 30, 2014
1998 Stock Incentive Plan
Sep. 30, 2014
1998 Stock Incentive Plan
Minimum
Sep. 30, 2014
1998 Stock Incentive Plan
Maximum
Sep. 30, 2014
1998 Stock Incentive Plan
Stock options
Sep. 30, 2014
1998 Non-Employee Director Stock Option Plan
Sep. 30, 2013
1998 Non-Employee Director Stock Option Plan
Sep. 30, 2013
2013 Plan
Sep. 30, 2014
2013 Plan
Jan. 28, 2013
2013 Plan
Capital Stock                          
Number of authorized classes of stock 2 2                      
Common stock, par value (in dollars per share) $ 0.01 $ 0.01                      
Par value of preferred stock (in dollars per share) $ 0.01 $ 0.01 $ 0.01                    
Shares of preferred stock authorized 5,000,000 5,000,000                      
Preferred stock, shares issued 0 0                      
Preferred stock, shares outstanding 0 0                      
Capital Stock                          
Award vesting period           2 years 4 years   3 years        
Term of award       10 years           10 years      
Shares of common stock reserved for issuance         1,050,000       150,000       800,000
Number of new awards to be granted   0                   768,212  
Options issued, outstanding and exercisable (in shares)               32,500          
Shares of common stock issued                     31,788    
Shares of common stock available for issuance   0                   768,212  
Number of Options                          
Outstanding at the beginning of the period (in shares) 42,500 218,000 302,300                    
Exercised (in shares) (10,000) (175,500) (84,300)                    
Outstanding at the end of the period (in shares) 32,500 42,500 218,000                    
Weighted-Average Exercise Price                          
Outstanding at the beginning of the period (in dollars per share) $ 13.59 $ 12.66 $ 10.84                    
Exercised (in dollars per share) $ 11.53 $ 12.44 $ 6.12                    
Outstanding at the end of the period (in dollars per share) $ 14.22 $ 13.59 $ 12.66                    
Aggregate Option Price                          
Outstanding at the beginning of the period (in dollars) $ 577 $ 2,760 $ 3,276                    
Exercised (in dollars) (115) (2,183) (516)                    
Outstanding at the end of the period (in dollars) $ 462 $ 577 $ 2,760