STATEMENTS OF CONSOLIDATED SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock in Treasury [Member]
Balance at Sep. 30, 2009	$ 609.3	$ 4.4	$ 119.0	$ 1,105.2	$ (59.9)	$ (559.4)
Balance, shares at Sep. 30, 2009		62,667,562				17,656,350
Comprehensive Income:
Net income	126.0			126.0
Foreign currency translation adjustment, net of tax	0.7				0.7
Net change in unrealized gain on available-for-sale securities, net of tax	0.2				0.2
Items not yet recognized as a component of net periodic pension costs, net of tax	(2.8)				(2.8)
Total comprehensive income	124.1
Dividends	(25.8)		0.3	(26.1)
Treasury shares acquired	(36.9)					(36.9)
Treasury shares acquired, shares		(1,092,469)				1,092,469
Stock awards and option exercises	35.9		(2.4)			38.3
Stock awards and option exercises, shares		1,211,790				(1,211,790)
Impact of Joint Venture	0.9		2.4	(1.5)
Balance at Sep. 30, 2010	707.5	4.4	119.3	1,203.6	(61.8)	(558.0)
Balance, shares at Sep. 30, 2010		62,786,883				17,537,029
Comprehensive Income:
Net income	133.5			133.5
Foreign currency translation adjustment, net of tax	(3.8)				(3.8)
Net change in unrealized gain on available-for-sale securities, net of tax	(0.2)				(0.2)
Items not yet recognized as a component of net periodic pension costs, net of tax	(13.2)				(13.2)
Total comprehensive income	116.3
Dividends	(27.0)		0.1	(27.1)
Treasury shares acquired	(115.3)					(115.3)
Treasury shares acquired, shares		(3,145,899)				3,145,899
Stock awards and option exercises	65.3		(0.4)			65.7
Stock awards and option exercises, shares		2,045,388				(2,045,388)
Impact of Joint Venture	(5.1)		(4.9)	(0.2)
Balance at Sep. 30, 2011	741.7	4.4	114.1	1,309.8	(79.0)	(607.6)
Balance, shares at Sep. 30, 2011	80,323,912	61,686,372				18,637,540
Comprehensive Income:
Net income	120.8			120.8
Foreign currency translation adjustment, net of tax	(1.5)				(1.5)
Net change in unrealized gain on available-for-sale securities, net of tax	0.5				0.5
Items not yet recognized as a component of net periodic pension costs, net of tax	2.0				2.0
Total comprehensive income	121.8
Dividends	(30.1)		0.2	(30.3)
Treasury shares acquired	(44.2)					(44.2)
Treasury shares acquired, shares		(1,532,232)				1,532,232
Stock awards and option exercises	23.4		2.5			20.9
Stock awards and option exercises, shares		642,783				(642,783)
Balance at Sep. 30, 2012	$ 812.6	$ 4.4	$ 116.8	$ 1,400.3	$ (78.0)	$ (630.9)
Balance, shares at Sep. 30, 2012	80,323,912	60,796,923				19,526,989