Common Stock (Schedule Of Transactions Under Our Stock Option Plans) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011
Balance Outstanding at October 1, 2010, Weighted Average Number of Shares	2,920,000
Granted, Weighted Average Number of Shares	628,000
Exercised, Weighted Average Number of Shares	(1,586,000)
Cancelled/Forfeited, Weighted Average Number of Shares	(258,000)
Balance Outstanding at September 30, 2011, Weighted Average Number of Shares	1,704,000
Exercisable at September 30, 2011, Weighted Average Number of Shares	551,000
Options Expected to Vest, Weighted Average Number of Shares	984,000
Balance Outstanding at October 1, 2010, Weighted Average Exercise Price	$ 26.02
Granted, Weighted Average Exercise Price	$ 39.18
Exercised, Weighted Average Exercise Price	$ 27.16
Cancelled/Forfeited, Weighted Average Exercise Price	$ 24.67
Balance Outstanding at September 30, 2011, Weighted Average Exercise Price	$ 30.05
Exercisable at September 30, 2011, Weighted Average Exercise Price	$ 27.63
Options Expected to Vest, Weighted Average Exercise Price	$ 30.85
Balance Outstanding at September 30, 2011, Weighted Average Remaining Contractual Term	7.5
Exercisable at September 30, 2011, Weighted Average Remaining Contractual Term	5.3
Options Expected to Vest, Weighted Average Remaining Contractual Term	8.5
Balance Outstanding at September 30, 2011, Aggregate Intrinsic Value	$ 5.8	[1]
Exercisable at September 30, 2011, Aggregate Intrinsic Value	1.7	[1]
Options Expected to Vest, Aggregate Intrinsic Value	3.7	[1]
Performance-Based Stock Options [Member]
Balance Outstanding at October 1, 2010, Weighted Average Number of Shares	897,000
Cancelled/Forfeited, Weighted Average Number of Shares	(373,000)
Balance Outstanding at September 30, 2011, Weighted Average Number of Shares	524,000
Balance Outstanding at October 1, 2010, Weighted Average Exercise Price	$ 19.39
Cancelled/Forfeited, Weighted Average Exercise Price	$ 19.39
Balance Outstanding at September 30, 2011, Weighted Average Exercise Price	$ 19.39
Balance Outstanding at September 30, 2011, Weighted Average Remaining Contractual Term	7.20
Balance Outstanding at September 30, 2011, Aggregate Intrinsic Value	$ 5.6	[2]

[1] The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $30.02, as reported by the New York Stock Exchange on September 30, 2011. This amount, which changes continuously based on the fair value of our common stock, would have been received by the option holders had all option holders exercised their options as of the balance sheet date

[2] The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $30.02 as reported by the New York Stock Exchange on September 30, 2011. This amount, which changes continuously based on the fair value of our common stock, would have been received by the option holders had the maximum performance targets been achieved and all option holders met the maximum performance targets and exercised their options as of the balance sheet date