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Employee Retirement Plans (Details 5) (Pension Plan [Member], USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	$ 290,000,000	$ 287,900,000	$ 279,800,000
Quoted Prices In Active Market For Identical Assets And Liabilities [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	287,700,000	285,600,000
Quoted Prices In Active Market For Identical Assets And Liabilities [Member] \| Equity Securities Domestic [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	143,100,000	161,500,000
Quoted Prices In Active Market For Identical Assets And Liabilities [Member] \| Fixed Income [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	113,600,000	88,900,000
Quoted Prices In Active Market For Identical Assets And Liabilities [Member] \| Cash Equivalents [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Quoted Prices In Active Market For Identical Assets And Liabilities [Member] \| Equity Securities International [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	31,000,000	35,200,000
Significant Other Observable Inputs [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	2,000,000	2,300,000
Significant Other Observable Inputs [Member] \| Equity Securities Domestic [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs [Member] \| Fixed Income [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs [Member] \| Cash Equivalents [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	2,000,000	2,300,000
Significant Other Observable Inputs [Member] \| Equity Securities International [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Unobservable Inputs [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Unobservable Inputs [Member] \| Equity Securities Domestic [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Unobservable Inputs [Member] \| Fixed Income [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Unobservable Inputs [Member] \| Cash Equivalents [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Unobservable Inputs [Member] \| Equity Securities International [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	0	0
Equity Securities Domestic [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	143,100,000	161,500,000
Fixed Income [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	113,600,000	88,900,000
Cash Equivalents [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	2,000,000	2,300,000
Equity Securities International [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	$ 31,000,000	$ 35,200,000

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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