Pension Plans - Percentage of Total Plan Assets (Details) - Pension Plan	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Asset Category	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Asset Category	31.00%	33.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Asset Category	42.00%	33.00%
Commodity Option
Defined Benefit Plan Disclosure [Line Items]
Asset Category	7.00%	1.00%
Insurance Company
Defined Benefit Plan Disclosure [Line Items]
Asset Category	10.00%	10.00%
Options
Defined Benefit Plan Disclosure [Line Items]
Asset Category	0.00%	2.00%
Cash
Defined Benefit Plan Disclosure [Line Items]
Asset Category	10.00%	21.00%