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Stock-based Compensation - Schedule of Stock Options and SSARs Outstanding and Exercisable (Details) - Stock Options - $ / shares
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options, Outstanding, Number (in shares) 643,907 650,223 560,784 429,973
Stock options outstanding - weighted average contractual remaining life 3 years 10 months 17 days      
Stock options, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 18.13 $ 18.12 $ 33.01 $ 48.80
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 18.40 $ 19.74 $ 48.73  
Stock options, Exercisable, Number (in shares) 491,029 355,703 310,120  
Stock options exercisable - weighted average contractual remaining life 3 years 3 months 11 days      
$1 - $15        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options - exercise price range, lower limit $ 1      
Stock options - exercise price range, upper limit $ 15      
Stock options, Outstanding, Number (in shares) 253,703      
Stock options outstanding - weighted average contractual remaining life 4 years 8 months 16 days      
Stock options, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 12.28      
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 12.02      
Stock options, Exercisable, Number (in shares) 204,328      
Stock options exercisable - weighted average contractual remaining life 4 years 7 months 10 days      
$15 - $20        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options - exercise price range, lower limit $ 16      
Stock options - exercise price range, upper limit $ 20      
Stock options, Outstanding, Number (in shares) 247,781      
Stock options outstanding - weighted average contractual remaining life 4 years 2 months 12 days      
Stock options, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 19.30      
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 19.43      
Stock options, Exercisable, Number (in shares) 144,278      
Stock options exercisable - weighted average contractual remaining life 2 years 10 months 2 days      
$21 - $30        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options - exercise price range, lower limit $ 21      
Stock options - exercise price range, upper limit $ 75      
Stock options, Outstanding, Number (in shares) 142,423      
Stock options outstanding - weighted average contractual remaining life 1 year 9 months 26 days      
Stock options, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 26.51      
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 26.51      
Stock options, Exercisable, Number (in shares) 142,423      
Stock options exercisable - weighted average contractual remaining life 1 year 9 months 26 days      
$1 - $30        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options - exercise price range, lower limit $ 1      
Stock options - exercise price range, upper limit $ 75