Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

v2.3.0.15
Stock-Based Compensation (Details) (USD $)
 12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Stock-Based Compensation      
Shares available for grants (in shares) 2,000,000    
Information pertaining to stock options vested and exercised      
Total income tax benefit recognized $ 3,700,000 $ 3,100,000 $ 2,900,000
RSUs
      
Stock-Based Compensation      
Compensation expense recognized 9,400,000 7,100,000 5,900,000
Summary of RSU activity      
Non-vested shares outstanding at the beginning of the period (in shares) 1,464,011    
Granted (in shares) 519,857    
Vested (in shares) (396,587)    
Forfeited (in shares) (59,595)    
Non-vested shares outstanding at the end of the period (in shares) 1,527,686 1,464,011  
Weighted-Average Grant-Date Fair value      
Non-vested shares outstanding at the beginning of the period (in dollars per share) $ 18.82    
Granted (in dollars per share) $ 31.80 $ 23.58 $ 15.27
Vested (in dollars per share) $ 20.86    
Forfeited (in dollars per share) $ 20.47    
Non-vested shares outstanding at the end of the period (in dollars per share) $ 22.64 $ 18.82  
Total fair value 14,500,000 9,900,000 6,500,000
Total unrecognized compensation cost related to unvested RSUs 23,900,000    
Unrecognized compensation cost period expected to be realized (in years) 4    
Weighted Average Disclosure      
Weighted average remaining life (in years) 1.7    
Information pertaining to stock options vested and exercised      
Cash paid to satisfy employees' personal income tax obligations 3,500,000 3,200,000 2,400,000
RSUs awarded before 2009
      
Stock-Based Compensation      
Award vesting period (in years) 6Y    
RSUs awarded in 2009 and after
      
Stock-Based Compensation      
Award vesting period (in years) 5Y    
Stock options
      
Stock-Based Compensation      
Award vesting period (in years) 4Y    
Compensation expense recognized 100,000 800,000 1,400,000
Summary of stock option activity      
Outstanding at the beginning of the period (in shares) 1,538,798    
Exercised (in shares) (772,210)    
Forfeited or expired (in shares) (912)    
Outstanding at the end of the period (in shares) 765,676 1,538,798  
Exercisable at the end of the period (in shares) 755,676    
Weighted Average Disclosure      
Outstanding at the beginning of the period (in dollars per share) $ 16.18    
Exercised (in dollars per share) $ 16.16    
Forfeited or expired (in dollars per share) $ 10.38    
Outstanding at the end of the period (in dollars per share) $ 16.18 $ 16.18  
Exercisable at the end of the period (in dollars per share) $ 16.08    
Intrinsic value of outstanding and exercisable stock options at the end of the period 14,200,000    
Weighted average remaining life (in years) 1.7    
Information pertaining to stock options vested and exercised      
Aggregate intrinsic value of all stock options exercised 15,102,000 4,730,000 1,752,000
Net cash proceeds from exercise of stock options 12,482,000 5,948,000 4,678,000
Stock options | Less than
      
Weighted-Average Grant-Date Fair value      
Total unrecognized compensation cost related to unvested RSUs $ 100,000    
Stock options issued prior to fiscal 2005
      
Weighted-Average Grant-Date Fair value      
Expiration period of options (in years) 10Y    
Stock options issued in fiscal 2005 and after
      
Weighted-Average Grant-Date Fair value      
Expiration period of options (in years) 6Y