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Employee Benefit Plans (Schedule of Actuarial Assumptions Used) (Details)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Pension Plan      
Assumptions used to determine benefit obligations:      
Discount rate 3.42% 4.22% 4.22%
Expected rate of compensation increase 4.00% 4.00% 4.00%
Assumptions used to determine benefit costs:      
Discount rate 4.22% 4.22% 4.82%
Expected long-term rate of return on plan assets 7.00% 7.00% 7.00%
Expected rate of compensation increase 4.00% 4.00% 4.00%
Postretirement Plan      
Assumptions used to determine benefit obligations:      
Discount rate 3.33% 4.15% 4.10%
Assumptions used to determine benefit costs:      
Discount rate 4.15% 4.10% 4.73%
Expected long-term rate of return on plan assets 4.89% 4.90% 4.92%