Pension Plans (Percentage Of Total Plan Assets) (Details) - Pension Plan [Member]	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Asset Category	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset Category	32.00%	35.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset Category	46.00%	46.00%
Commodity Option [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset Category	2.00%	1.00%
Insurance Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset Category	12.00%	12.00%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset Category	8.00%	6.00%