Consolidated Statements of Total Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income	Non-controlling Interests
Beginning Balances at Sep. 30, 2011	$ 2,623.5	$ 3.2	$ 1,917.0	$ 834.6	$ (134.3)	$ 0.1	$ 2.9
Increase (Decrease) in Stockholders' Equity
Net income	956.3			956.3
Issuances under employee benefit plans (79,455 shares in 2012, 63,105 shares in 2013, 77,216 shares in 2014)	0.9		0.9
Exercise of stock options (4,493,797 shares in 2012, 1,785,412 shares in 2013, 2,687,724 shares in 2014)	40.8	0.1	40.7
Stock issued under Performance Unit Plan (275,625 shares in 2012, 203,125 shares in 2013, 288,685 shares in 2014)	(3.1)		(3.1)
Stock based compensation expense	18.1		18.1
Cash dividends declared	(47.8)			(47.8)
Other comprehensive income (loss)	0.1					0.1
Noncontrolling interests	(0.3)						(0.3)
Ending Balances at Sep. 30, 2012	3,594.7	3.3	1,979.8	1,743.1	(134.3)	0.2	2.6
Increase (Decrease) in Stockholders' Equity
Net income	462.7			462.7
Issuances under employee benefit plans (79,455 shares in 2012, 63,105 shares in 2013, 77,216 shares in 2014)	1.1		1.1
Exercise of stock options (4,493,797 shares in 2012, 1,785,412 shares in 2013, 2,687,724 shares in 2014)	37.8		37.8
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	6.7	0	6.7
Stock issued under Performance Unit Plan (275,625 shares in 2012, 203,125 shares in 2013, 288,685 shares in 2014)	(2.4)		(2.4)
Stock based compensation expense	19.0		19.0
Cash dividends declared	(60.2)			(60.2)
Other comprehensive income (loss)	1.7					1.7
Noncontrolling interests	0.3						0.3
Ending Balances at Sep. 30, 2013	4,061.4	3.3	2,042.0	2,145.6	(134.3)	1.9	2.9
Increase (Decrease) in Stockholders' Equity
Net income	533.5			533.5
Issuances under employee benefit plans (79,455 shares in 2012, 63,105 shares in 2013, 77,216 shares in 2014)	1.4		1.4
Exercise of stock options (4,493,797 shares in 2012, 1,785,412 shares in 2013, 2,687,724 shares in 2014)	43.8	0	43.8
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(3.4)	0	(3.4)
Stock issued under Performance Unit Plan (275,625 shares in 2012, 203,125 shares in 2013, 288,685 shares in 2014)	(5.5)		(5.5)
Conversion of Stock, Amount Issued		0.4	498.2
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments	498.6
Stock based compensation expense	26.2		26.2
Cash dividends declared	(48.6)			(48.6)
Other comprehensive income (loss)	0.3					0.3
Noncontrolling interests	1.0						1.0
Ending Balances at Sep. 30, 2014	$ 5,119.7	$ 3.7	$ 2,613.7	$ 2,630.5	$ (134.3)	$ 2.2	$ 3.9