Consolidated Statements of Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning balance at Sep. 30, 2010			$ 1,473.7	$ (802.0)	$ 551.8	$ 10.7	$ 0
Beginning shares (in shares) at Sep. 30, 2010		339.1
Shares issued:
Employee stock plans (in shares)		2.8
Treasury stock retired (in shares)		0
Additional paid-in capital
Employee stock plan shares issued			25.0
Share-based compensation			43.8
Treasury shares acquired	(50.1)			(50.1)
RSA forfeitures				(3.1)
Treasury stock retirement			0	0	0
Dividends declared					(71.6)
Other comprehensive income (loss)						(19.5)
Change in ownership							2.4
Net income (loss)					283.6		0
Unrealized gains (losses) on securities						0.1
Foreign currency translation						(8.9)
Ending balance at Sep. 30, 2011			1,542.5	(855.2)	763.8	(8.8)	2.4
Ending balance at Sep. 30, 2011		0.1
Ending shares (in shares) at Sep. 30, 2011		341.9
Shares issued:
Employee stock plans (in shares)		1.6
Treasury stock retired (in shares)		0
Additional paid-in capital
Employee stock plan shares issued			9.4
Share-based compensation			33.2
Treasury shares acquired	(475.2)			(475.2)
RSA forfeitures				(2.5)
Treasury stock retirement			0	0	0
Dividends declared					(68.7)
Other comprehensive income (loss)						13.3
Change in ownership							(2.4)
Net income (loss)					245.9		0
Unrealized gains (losses) on securities						0
Foreign currency translation						4.5
Total comprehensive income	4.5
Ending balance at Sep. 30, 2012	1,197.8		1,585.1	(1,332.9)	941.0	4.5	0
Ending balance at Sep. 30, 2012	0.1	0.1
Ending shares (in shares) at Sep. 30, 2012	343.5	343.5
Shares issued:
Employee stock plans (in shares)		2.9
Treasury stock retired (in shares)		(75.0)
Additional paid-in capital
Employee stock plan shares issued			23.7
Share-based compensation			39.4
Treasury shares acquired	(190.5)			(190.5)
RSA forfeitures				(3.7)
Treasury stock retirement			(215.1)	1,252.2	(1,037.1)
Dividends declared					(88.9)
Other comprehensive income (loss)	3.7					3.7
Change in ownership							0
Net income (loss)					272.7		0
Unrealized gains (losses) on securities						0
Foreign currency translation						4.5
Total comprehensive income	8.2
Ending balance at Sep. 30, 2013	1,254.1		1,433.1	(274.9)	87.7	8.2	0
Ending balance at Sep. 30, 2013	$ 0	$ 0
Ending shares (in shares) at Sep. 30, 2013	271.4	271.4