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Stockholders' Equity (Detail 2) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Feb. 05, 2014
Dec. 12, 2013
Sep. 30, 2013
May 17, 2012
May 31, 2011
Nov. 30, 2010
Feb. 02, 2010
Dec. 02, 2008
Stockholders' Equity                          
Share repurchase program approved amount $ 101,900,000                       $ 10,000,000
Total Number of Shares Purchased 2,962,978   229,575 1,225,019 707,462                
Total Number of Shares Purchased   505,067                      
Average Price Paid per Share (in dollars per share) $ 15.90 $ 59.41 $ 15.39 $ 11.53 $ 5.50                
Total Cash Paid for Shares Purchased 44,873,000 29,999,000 3,541,000 14,471,000 3,874,000                
Total Cash Paid for Shares Purchased   30,000,000                      
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs 5,127,000 18,114,000 18,114,000 1,655,000 6,126,000     31,000,000          
Additional amount authorized under share repurchase program           $ 19,000,000 $ 12,900,000   $ 30,000,000 $ 10,000,000 $ 10,000,000 $ 10,000,000