Share Based Compensation (Details 1) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011 Year Sites
Summary of stock options
Outstanding shares, beginning balance	10,351
Granted, shares	1,727
Exercised, shares	(4,164)
Forfeited, shares	(126)
Cancelled, shares	(7)
Outstanding shares, ending balance	7,781
Vested or expected to vest, shares	7,480
Exercisable, shares	3,911
Outstanding, Weighted avg exercise price beginning balance	$ 44.34
Granted, Weighted Avg Exercise price	$ 69.87
Exercised, Weighted Avg Exercise price	$ 41.46
Forfeited, Weighted Avg Exercise price	$ 49.08
Cancelled, Weighted Avg Exercise price	$ 51.94
Outstanding, Weighted avg exercise price ending balance	$ 51.46
Vested or expected, Weighted Avg Exercise price	$ 51.40
Exercisable, Weighted Avg Exercise price	$ 50.01
Outstanding, Weighted Avg remaining contractual term (years)	6.8
Vested or expected ,Weighted Avg remaining contractual term (years)	6.8
Exercisable, Weighted Avg remaining contractual term (years)	5.3
Outstanding, Aggregate intrinsic value of in the money options	$ 72.4
Vested or expected, Aggregate intrinsic value of in the money options	69.6
Exercisable, Aggregate intrinsic value of in the money options	$ 37.0