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Stockholders' Equity (Detail) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2010
Sep. 30, 2009
Dec. 02, 2005
Sep. 30, 2014
Minimum
Sep. 30, 2014
Maximum
Sep. 30, 2014
Options granted to employees
Performance-based
Sep. 30, 2014
Options granted to employees
Performance-based
Minimum
Sep. 30, 2014
Options granted to employees
Performance-based
Maximum
Sep. 30, 2014
Incentive stock options
Holder of at least 10% of common stock
Minimum
Sep. 30, 2014
Employee and director options
Sep. 30, 2013
Employee and director options
Sep. 30, 2012
Employee and director options
Sep. 30, 2011
Employee and director options
Sep. 30, 2010
Employee and director options
Sep. 30, 2014
Employee and director options
Minimum
Sep. 30, 2013
Employee and director options
Minimum
Sep. 30, 2012
Employee and director options
Minimum
Sep. 30, 2011
Employee and director options
Minimum
Sep. 30, 2010
Employee and director options
Minimum
Sep. 30, 2014
Employee and director options
Maximum
Sep. 30, 2013
Employee and director options
Maximum
Sep. 30, 2012
Employee and director options
Maximum
Sep. 30, 2011
Employee and director options
Maximum
Sep. 30, 2010
Employee and director options
Maximum
Sep. 30, 2014
Restricted shares
Sep. 30, 2013
Restricted shares
Sep. 30, 2012
Restricted shares
Sep. 30, 2011
Restricted shares
Sep. 30, 2010
Restricted shares
Sep. 30, 2014
Restricted shares
Minimum
Sep. 30, 2013
Restricted shares
Minimum
Sep. 30, 2012
Restricted shares
Minimum
Sep. 30, 2011
Restricted shares
Minimum
Sep. 30, 2010
Restricted shares
Minimum
Sep. 30, 2014
Restricted shares
Maximum
Sep. 30, 2013
Restricted shares
Maximum
Sep. 30, 2012
Restricted shares
Maximum
Sep. 30, 2011
Restricted shares
Maximum
Sep. 30, 2010
Restricted shares
Maximum
Sep. 30, 2013
Restricted shares
Performance-based
Non-employee
Sep. 30, 2012
Restricted shares
Performance-based
Non-employee
Sep. 30, 2014
Options or stock appreciation rights
Maximum
Sep. 30, 2014
Other than options or stock appreciation rights
Maximum
2006 Omnibus Long-Term Incentive Plan (the 2006 Plan)                                                                                        
Actual payout as a percent of employee target payout, based upon the entity's actual performance during the previous twelve months               0.00% 100.00%                                                                      
Shares available for issuance       10,000,000                                                                                
Remaining shares reserved for issuance 772,227 3,986,513 5,189,996                                                                                  
Options granted (in shares)                     437,755 171,994 181,783 321,072 624,566                                                          
Options granted, exercise prices (in dollars per share)                     $ 22.41 $ 35.76 $ 34.42     $ 21.53 $ 29.47 $ 31.37 $ 14.30 $ 9.05 $ 31.37 $ 46.72 $ 42.31 $ 17.02 $ 13.96                                      
Options forfeited (in shares)                     181,094 32,244 78,148 73,591 75,467                                                          
Restricted shares granted (in shares)                                                   1,040,748 997,857 633,647 736,340 699,410                     335,000 100,000    
Restricted shares granted (in dollars per share)                                                   $ 18.78 $ 36.97 $ 34.05     $ 13.11 $ 29.47 $ 31.37 $ 12.88 $ 9.05 $ 38.09 $ 42.47 $ 52.55 $ 25.52 $ 13.96        
Restricted shares forfeited (in shares)                                                   250,586 403,083 138,052 150,112 45,026                     281,500      
Number of shares awarded per person per year                                                                                     1,000,000 700,000
Shares and options vesting period         1 year 4 years 12 months                                                                          
Exercise price of stock option as a percentage of the fair market value of the common stock on the date of grant                   110.00%           100.00%                                                        
Term of stock option                                         10 years