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Retirement Plans (Assumptions Used) (Details) - Pension Plan, Defined Benefit [Member]
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Weighted average used to determine benefit obligations:      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.68% 4.84% 4.49%
Weighted average used to determine net periodic cost:      
Discount rate 3.92% 4.49% 5.16%
Expected return on plan assets 5.50% 6.21% 6.24%