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Pension Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | $ 77,757 | $ 68,875
Government |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 48,146 | 27,322
Equities in Funds |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 9,550 |
Corporate Investment Grade |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  |  | 1,632
Large Capitalization Stocks |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  |  | 20,864
Commodity Option |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 4,309 | 4,977
Insurance Company Funds |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | [1] | 7,385 | 7,102
Options |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 90 |
Cash |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 8,277 | 6,978
Level 1 |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 70,372 | 61,773
Level 1 | Government |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 48,146 | 27,322
Level 1 | Equities in Funds |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 9,550 |
Level 1 | Corporate Investment Grade |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  |  | 1,632
Level 1 | Large Capitalization Stocks |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  |  | 20,864
Level 1 | Commodity Option |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 4,309 | 4,977
Level 1 | Insurance Company Funds |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | [1] | 0 | 0
Level 1 | Options |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 90 |
Level 1 | Cash |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 8,277 | 6,978
Level 2 |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 7,385 | 7,102
Level 2 | Government |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 0 | 0
Level 2 | Equities in Funds |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Level 2 | Corporate Investment Grade |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  |  | 0
Level 2 | Large Capitalization Stocks |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  |  | 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 | [1] | 7,385 | 7,102
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 | Equities in Funds |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Level 3 | Corporate Investment Grade |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  |  | 0
Level 3 | Large Capitalization Stocks |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  |  | 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 | [1] | 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
[1] | These investments are comprised primarily of funds invested with an insurance company in Japan with a guaranteed rate of return. The insurance company invests these assets primarily in government and corporate bonds.

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