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Employee Retirement Plans - Schedule of Health Care Cost Trend Rates (Details)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Retirement Benefits [Abstract]    
Health care cost trend rate assumed for next year 6.75% 7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) 5.00% 5.00%
Fiscal year that the rate reaches the ultimate trend rate 2026 2026