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Pension Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 68,875 | $ 67,581
Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 27,322 | 20,430
Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,632 | 2,038
Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 20,864 | 22,379
Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 4,977 | 599
Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 7,102 | 6,823
Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets |  | 1,430
Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 6,978 | 13,882
Level 1 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 61,773 | 60,758
Level 1 | Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 27,322 | 20,430
Level 1 | Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,632 | 2,038
Level 1 | Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 20,864 | 22,379
Level 1 | Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 4,977 | 599
Level 1 | Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets |  | 1,430
Level 1 | Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 6,978 | 13,882
Level 2 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 7,102 | 6,823
Level 2 | Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 7,102 | 6,823
Level 2 | Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets |  | 0
Level 2 | Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets |  | 0
Level 3 | Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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