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Employee Retirement Plans (Details 6) (Other Postretirement Benefits [Member], USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Fair Value of Plan Assets
Fair Value of Plan Assets	$ 9,800,000	$ 10,000,000	$ 9,700,000
Quoted Prices In Active Market For Identical Assets And Liabilities [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	9,400,000	9,500,000
Quoted Prices In Active Market For Identical Assets And Liabilities [Member] \| Equity Securities Domestic [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	6,100,000	6,500,000
Quoted Prices In Active Market For Identical Assets And Liabilities [Member] \| Fixed Income Funds [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	3,300,000	3,000,000
Quoted Prices In Active Market For Identical Assets And Liabilities [Member] \| Cash and Cash Equivalents [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	400,000	500,000
Significant Other Observable Inputs [Member] \| Equity Securities Domestic [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs [Member] \| Fixed Income Funds [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs [Member] \| Cash and Cash Equivalents [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	400,000	500,000
Unobservable Inputs [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0	0
Unobservable Inputs [Member] \| Equity Securities Domestic [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0	0
Unobservable Inputs [Member] \| Fixed Income Funds [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0	0
Unobservable Inputs [Member] \| Cash and Cash Equivalents [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0	0
Equity Securities Domestic [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	6,100,000	6,500,000
Fixed Income Funds [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	3,300,000	3,000,000
Cash and Cash Equivalents [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	$ 400,000	$ 500,000

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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