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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Common stock awards4,000,000  
Outstanding options maximum term (in years)10  
Vesting and restriction period minimum (in months)13  
Total fair value of the shares vested$ 2.7$ 3.0$ 2.7
Weighted average fair value of stock options$ 15.72$ 14.69$ 5.75
Restricted Stock [Member]
   
Vesting period minimum (in years)three  
Vesting period maximum (in years)four  
2007 Plan [Member]
   
Common stock awards1,895,274  
Vesting period minimum (in years)1  
Vesting period maximum (in years)4  
2001 Plan [Member]
   
Vesting period minimum (in years)1  
Vesting period maximum (in years)4  
1996 Plan [Member]
   
Vesting period minimum (in years)2  
Vesting period maximum (in years)5