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Pension and Retirement Plans - Fair value of plan assets (Details) $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2024 GBP (£) | Mar. 31, 2025 USD ($) | Dec. 31, 2024 | Sep. 30, 2024 USD ($)
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | $ 8,626 |  | $ 11,366
Company contributions | £ | £ 0.6 |  |  |
Cash on deposit |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 179 |  | 65
Fixed income |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 10,388
Buy-in contract* |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 8,447 |  | 0
Acquisition of buy-in contract | £ | £ 8.5 |  |  |
Equity |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 913
Level 1 |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 179 |  | 9,042
Level 1 | Cash on deposit |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 179 |  | 65
Level 1 | Fixed income |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 8,714
Level 1 | Buy-in contract* |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 0
Level 1 | Equity |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 263
Level 2 |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 2,324
Level 2 | Cash on deposit |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 0
Level 2 | Fixed income |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 1,674
Level 2 | Buy-in contract* |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 0
Level 2 | Equity |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 650
Level 3 |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 8,447 |  | 0
Level 3 | Cash on deposit |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 0
Level 3 | Fixed income |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | 0 |  | 0
Level 3 | Buy-in contract* |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | $ 8,447 |  | $ 0
Expected term on plan assets |  | 20 years |  |
Expected return on plan assets |  |  | 5.00% | 4.50%
Level 3 | Equity |  |  |  |
Pension and Retirement Plans |  |  |  |
Fair value of the assets |  | $ 0 |  | $ 0

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- Definition Period of maturity on plan assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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