Employee Benefit Plans - Schedule of Weighted-Average Asset Allocations (Details)	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation (as a percent)	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	10.00%
Weighted average asset allocation (as a percent)	7.00%	7.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	90.00%
Weighted average asset allocation (as a percent)	92.00%	92.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation (as a percent)	1.00%	1.00%
Minimum \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	3.00%
Minimum \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	80.00%
Minimum \| Other
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	0.00%
Maximum \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	10.00%
Maximum \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	100.00%
Maximum \| Other
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	10.00%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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