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Summary of Significant Accounting Policies (Detail 6) (Restricted shares, USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Earnings per Share        
Unvested restricted shares 1,897,827 1,543,869 1,399,609 1,294,082
Issue price (in dollars per share) $ 24.96 $ 28.89 $ 22.51 $ 13.13
Unvested shares included in calculation of diluted income per share 341,137 383,831    
Minimum
       
Earnings per Share        
Issue price (in dollars per share) $ 7.48 $ 7.48 $ 7.48  
Maximum
       
Earnings per Share        
Issue price (in dollars per share) $ 52.55 $ 52.55 $ 52.55