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Equity Securities and Stock-Based Compensation (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
shares
Equity Securities and Stock-based Compensation      
Common stock, authorized shares 200,000,000 200,000,000  
Preferred stock, shares authorized 10,000,000    
Preferred stock, shares issued 0 0 0
Preferred stock, shares outstanding 0 0 0
Stock-based compensation | $ $ 3,181 $ 2,826 $ 2,165
Total income tax benefit recognized for stock-based compensation | $ $ 1,100 $ 1,000 $ 0
Awards granted vesting period 3 years    
Contractual term 10 years    
Stock Appreciation Rights (SARs) and Restricted Stock      
Equity Securities and Stock-based Compensation      
Board approved share-based award grants to officers, employees, and directors (in shares) 300,000 300,000 500,000
Period of average stock price hurdles that precluded vesting 60 days    
Multiple of cash interest expense used in calculating the thresholds for vesting 1.5    
Restricted stock      
Equity Securities and Stock-based Compensation      
Awards granted vesting period 3 years    
2010 Incentive Compensation Plan | Stock Appreciation Rights (SARs)      
Equity Securities and Stock-based Compensation      
Awards granted vesting period 3 years    
Contractual term 10 years    
DDCP      
Equity Securities and Stock-based Compensation      
Treasury stock and related deferred compensation obligation at fair value | $ $ 1,800    
Amount that the fair values of treasury stock and related deferred compensation obligation exceed the carrying values at cost | $ $ 400