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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Feb. 18, 2016
Feb. 17, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 2,841 $ 1,583 $ 2,092    
Income tax benefit recognized related to stock-based compensation $ 1,061 586 774    
Shares reserved for issuance under Incentive Compensation Plan 700,000     700,000 500,000
Total intrinsic value of options exercised $ 0 0 34    
Income tax benefit from exercise of stock options 0 0 13    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense related to restricted share awards $ 3,194        
Unrecognized compensation expense expected to be recognize, years 1 year        
Total fair value of shares vested $ 1,327 $ 1,453 $ 3,556    
Weighted average fair value $ 37.80 $ 34.62 $ 47.97    
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Contractual Term 10 years        
Minimum [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year        
Minimum [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 0 years        
Maximum [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Maximum [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years