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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2016
Feb. 29, 2016
Sep. 30, 2015
Feb. 28, 2015
Feb. 28, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
2014 Equity Incentive Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Common stock, capital shares reserved for future issuance         750,000        
Shares issued under the plan           63,628      
Number of shares available for grant           664,911      
2014 Non-Employee Director Equity Incentive Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Common stock, capital shares reserved for future issuance         150,000 101,600      
Restricted Stock Units (RSUs)                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Unvested restricted stock outstanding     133,506     159,988 133,506 106,845 81,555
Compensation expense           $ 4.2 $ 1.9 $ 2.1  
Amounts not yet recognized related to non-vested stock totaled     $ 1.9     $ 2.1 1.9    
Weighted average remaining contractual life           1 year 9 months 29 days      
Restricted Stock Units (RSUs) | 2014 Equity Incentive Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Unvested restricted stock outstanding           159,988      
Restricted Stock Units (RSUs) | 2014 Equity Incentive Plan | Time Based Restricted Stock Unit                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Actual amount of RSUs earned based on cumulative earnings   60.00%              
Vesting period   3 years              
Restricted Stock Units (RSUs) | 2014 Equity Incentive Plan | Performance Based Restricted Stock Unit                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting period   3 years              
Target RSUs granted range   40.00%              
Restricted Stock                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Compensation expense           $ 0.7 $ 1.3 $ 1.3  
Weighted average remaining contractual life           9 months 26 days      
Restricted Stock | 2014 Non-Employee Director Equity Incentive Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting period         2 years        
Unvested restricted stock outstanding     26,200     26,800 26,200    
Shares issued under the plan 1,000 16,000 1,400 16,000          
Maximum number of Share granted to any individual         12,000        
Number of share issued to any individual         4,000        
Restricted stock issuable to eligible Board of Directors members annually         2,000        
Shares issued, price per share $ 29.38 $ 25.63 $ 29.48 $ 33.37     $ 29.48    
Restricted Stock | 2014 Non-Employee Director Equity Incentive Plan | Vesting of First Anniversary                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting percentage         50.00%        
Restricted Stock | 2014 Non-Employee Director Equity Incentive Plan | Vesting of Second Anniversary                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting percentage         50.00%