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Pension Plans - Percentage of Total Plan Assets (Details) - Pension Plan	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Asset Category	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Asset Category	35.00%	33.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Asset Category	34.00%	34.00%
Commodity Option
Defined Benefit Plan Disclosure [Line Items]
Asset Category	11.00%	11.00%
Insurance Company
Defined Benefit Plan Disclosure [Line Items]
Asset Category	12.00%	13.00%
Options
Defined Benefit Plan Disclosure [Line Items]
Asset Category	1.00%	1.00%
Cash
Defined Benefit Plan Disclosure [Line Items]
Asset Category	7.00%	8.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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