Retirement Plan And Other Post-Retirement Benefits (Narrative) (Details) $ in Millions	6 Months Ended
Mar. 31, 2024 USD ($)
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Company's contributions	$ 0.0
Retirement Plan \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Estimated future contributions in remainder of fiscal year	0.0
Retirement Plan \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Estimated future contributions in remainder of fiscal year	5.0
VEBA Trusts
Defined Benefit Plan Disclosure [Line Items]
Company's contributions	0.0
Estimated future contributions in remainder of fiscal year	$ 0.0

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration