Annual report pursuant to Section 13 and 15(d)

Equity (Details)

v3.3.0.814
Equity (Details) - USD ($)
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Stock-based compensation      
Shares available for grants 2,100,000    
Information pertaining to stock options vested and exercised      
Total income tax benefit recognized $ 7,100,000 $ 7,000,000 $ 5,200,000
Cash paid to satisfy employees personal tax liability 12,451,000 14,681,000 8,868,000
Unvested restricted stock units      
Stock-based compensation      
Compensation expense recognized $ 17,200,000 $ 17,300,000 $ 14,600,000
Summary of RSU activity      
Non-vested shares outstanding at the beginning of the period 1,884,901    
Granted (in shares) 382,727    
Vested (in shares) (1,376,096)    
Forfeited (in shares) (29,992)    
Non-vested shares outstanding at the end of the period 861,540 1,884,901  
Deferred vested award 800,000    
Weighted-Average Grant-Date Fair value      
Non-vested shares outstanding at the beginning of the period (in dollars per share) $ 24.32    
Granted (in dollars per share) 50.82 $ 46.49 $ 30.66
Vested (in dollars per share) 20.05    
Forfeited (in dollars per share) 37.15    
Non-vested shares outstanding at the end of the period (in dollars per share) $ 42.48 $ 24.32  
Total fair value $ 68,600,000 $ 38,700,000 $ 40,800,000
Total unrecognized compensation cost related to unvested RSUs $ 33,100,000    
Unrecognized compensation cost period expected to be realized 4 years    
Weighted Average Exercise Price      
Weighted average remaining life   1 year 6 months  
RSUs awarded in 2009 and after | Minimum      
Stock-based compensation      
Award vesting period 1 year    
RSUs awarded in 2009 and after | Maximum      
Stock-based compensation      
Award vesting period 5 years    
Stock options      
Stock-based compensation      
Award vesting period 4 years    
Compensation expense recognized $ 0 $ 0 0
Award expired period 10 years    
Summary of stock option activity      
Outstanding at the beginning of the period (in shares) 260,000    
Exercised (in shares) (100,000)    
Outstanding and exercisable at the end of the period (in shares) 160,000 260,000  
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 9.00    
Exercised (in dollars per share) 8.68    
Outstanding and exercisable at the end of the period (in dollars per share) $ 9.18 $ 9.00  
Intrinsic value of outstanding and exercisable stock options at the end of the period $ 8,100,000    
Weighted average remaining life 1 year 6 months    
Information pertaining to stock options vested and exercised      
Aggregate intrinsic value of all stock options exercised $ 5,536,000 $ 5,698,000 7,081,000
Net cash proceeds from exercise of stock options $ 868,000 $ 1,362,000 $ 2,168,000
Stock awards utilized to satisfy employees' personal tax requirements (in shares) 195,000    
Cash paid to satisfy employees personal tax liability $ 11,600,000