Statements Of Consolidated Shareholders' Equity And Comprehensive Income (Loss) (USD $) In Millions, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock In Treasury [Member]	Total
Balance Beginning at Sep. 30, 2008	$ 4.4	$ 111.2	$ 1,536.1	$ (4.2)	$ (564.9)	$ 1,082.6
Balance Beginning, Shares at Sep. 30, 2008	62,508,934				17,814,978
Comprehensive Income (Loss):
Net income (loss)			(405.0)			(405.0)
Foreign currency translation adjustment, net of tax of $0.9, $1.3 & $0.5 million in the year 2009, 2010 & 2011 respectively				(15.0)		(15.0)
Net change in unrealized gain on available-for-sale securities, net of tax of $0.1, $0.1 & $0.0 million in the year 2009, 2010 & 2011 respectively				(0.3)		(0.3)
Items not yet recognized as a component of net periodic pension costs, net of tax of $25.0, $0.1 & $8.9 million in the year 2009, 2010, and 2011 respectively				(40.4)		(40.4)
Total comprehensive income (loss)						(460.7)
Dividends		0.3	(25.9)			(25.6)
Treasury shares acquired, value					(0.6)	(0.6)
Treasury shares acquired, shares	(32,481)				32,481
Stock awards and option exercises		7.5			6.1	13.6
Stock awards and option exercises, Shares	191,109				(191,109)
Ending Balance at Sep. 30, 2009	4.4	119.0	1,105.2	(59.9)	(559.4)	609.3
Ending Balance, Shares at Sep. 30, 2009	62,667,562				17,656,350
Comprehensive Income (Loss):
Net income (loss)			126.0			126.0
Foreign currency translation adjustment, net of tax of $0.9, $1.3 & $0.5 million in the year 2009, 2010 & 2011 respectively				0.7		0.7
Net change in unrealized gain on available-for-sale securities, net of tax of $0.1, $0.1 & $0.0 million in the year 2009, 2010 & 2011 respectively				0.2		0.2
Items not yet recognized as a component of net periodic pension costs, net of tax of $25.0, $0.1 & $8.9 million in the year 2009, 2010, and 2011 respectively				(2.8)		(2.8)
Total comprehensive income (loss)						124.1
Dividends		(0.3)	26.1			25.8
Treasury shares acquired, value					(36.9)	(36.9)
Treasury shares acquired, shares	(1,092,469)				1,092,469
Stock awards and option exercises		(2.4)			38.3	35.9
Stock awards and option exercises, Shares	1,211,790				(1,211,790)
Impact of Joint Venture		2.4	(1.5)			0.9
Ending Balance at Sep. 30, 2010	4.4	119.3	1,203.6	(61.8)	(558.0)	707.5
Ending Balance, Shares at Sep. 30, 2010	62,786,883				17,537,029
Comprehensive Income (Loss):
Net income (loss)			133.5			133.5
Foreign currency translation adjustment, net of tax of $0.9, $1.3 & $0.5 million in the year 2009, 2010 & 2011 respectively				(3.8)		(3.8)
Net change in unrealized gain on available-for-sale securities, net of tax of $0.1, $0.1 & $0.0 million in the year 2009, 2010 & 2011 respectively				(0.2)		(0.2)
Items not yet recognized as a component of net periodic pension costs, net of tax of $25.0, $0.1 & $8.9 million in the year 2009, 2010, and 2011 respectively				(13.2)		(13.2)
Total comprehensive income (loss)						116.3
Dividends		(0.1)	27.1			27.0
Treasury shares acquired, value					(115.3)	(115.3)
Treasury shares acquired, shares	(3,145,899)				3,145,899	26,700,000
Stock awards and option exercises		(0.4)			65.7	65.3
Stock awards and option exercises, Shares	2,045,388				(2,045,388)
Impact of Joint Venture		(4.9)	(0.2)			(5.1)
Ending Balance at Sep. 30, 2011	$ 4.4	$ 114.1	$ 1,309.8	$ (79.0)	$ (607.6)	$ 741.7
Ending Balance, Shares at Sep. 30, 2011	61,686,372				18,637,540