v2.4.0.8
Summary of Significant Accounting Policies (Details 5) (USD $)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Income Taxes.      
Uncertain tax positions identified during analysis $ 0    
Advertising Costs      
Advertising costs 4,560,000 4,939,000 4,768,000
Comprehensive income:      
Comprehensive income $ 40,376,000 $ 49,490,000 $ 13,209,000
Earnings per Share      
Treasury stock effect of options and restricted stock (in shares) 1,040,310 1,928,283 1,345,068
Restricted shares
     
Earnings per Share      
Unvested restricted shares 1,543,869 1,399,609 1,294,082
Issue price (in dollars per share) $ 28.89 $ 22.51 $ 13.13
Unvested shares included in calculation of diluted income per share 383,831    
Restricted shares | Minimum
     
Earnings per Share      
Issue price (in dollars per share) $ 7.48 $ 7.48 $ 7.48
Restricted shares | Maximum
     
Earnings per Share      
Issue price (in dollars per share) $ 52.55 $ 52.55 $ 25.52