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Benefit Plans, Actuarial Assumptions (Details)
12 Months Ended
Sep. 30, 2011
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] 
Discount Rate3.10%
Rate of Compensation Increase0.00%[1]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] 
Discount Rate, Periodic Benefit Costs3.60%
Expected Return on Assets4.30%
Net Periodic Benefit Cost, Rate of Compensation Increase0.00%[1]
[1](1) There is no assumed rate of compensation increase as there have been no current active members since April 2006