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Retirement Benefits (Schedule of Health Care Costs Sensitivity) (Details) - Other Postretirement Benefit Plans [Member]
$ in Thousands
12 Months Ended
Sep. 30, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect on projected fiscal year 2018 service and interest cost, 1% increase $ 113
Effect on projected fiscal year 2018 service and interest cost, 1% decrease (99)
Effect on accumulated postretirement benefit obligation, 1% increase 2,960
Effect on accumulated postretirement benefit obligation, 1% decrease $ (2,605)