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Pension and Retirement Plans (Tables) | 3 Months Ended
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Dec. 31, 2024
Pension and Retirement Plans |
Schedule of net benefit costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended December 31,
​ | ​ | 2024 | ​ | 2023
​ |  | U.K. |  | U.S. |  | Total |  | U.K. |  | U.S. |  | Total
​ | ​ | (Amounts in thousands)
Pension: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest cost | ​ | $ | 105 | ​ | $ | 2 | ​ | $ | 107 | ​ | $ | 112 | ​ | $ | 3 | ​ | $ | 115
Expected return on plan assets | ​ |  | (122) | ​ |  | — | ​ |  | (122) | ​ |  | (150) | ​ |  | — | ​ |  | (150)
Amortization of past service costs | ​ | ​ | 2 | ​ | ​ | — | ​ | ​ | 2 | ​ | ​ | 2 | ​ | ​ | — | ​ | ​ | 2
Amortization of net gain | ​ |  | — | ​ |  | (2) | ​ |  | (2) | ​ |  | — | ​ |  | (1) | ​ |  | (1)
Net periodic (benefit) cost | ​ | $ | (15) | ​ | $ | — | ​ | $ | (15) | ​ | $ | (36) | ​ | $ | 2 | ​ | $ | (34)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Post Retirement: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Service cost | ​ | $ | — | ​ | $ | 7 | ​ | $ | 7 | ​ | $ | — | ​ | $ | 6 | ​ | $ | 6
Interest cost | ​ |  | — | ​ |  | 15 | ​ |  | 15 | ​ |  | — | ​ |  | 16 | ​ |  | 16
Amortization of net gain | ​ |  | — | ​ |  | (30) | ​ |  | (30) | ​ |  | — | ​ |  | (43) | ​ |  | (43)
Net periodic benefit | ​ | $ | — | ​ | $ | (8) | ​ | $ | (8) | ​ | $ | — | ​ | $ | (21) | ​ | $ | (21)
Schedule of fair value of plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Values as of
​ | ​ | December 31, 2024 | ​ | September 30, 2024
​ | ​ | Fair Value Measurements Using Inputs Considered as | ​ | Fair Value Measurements Using Inputs Considered as
Asset Category |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
​ | ​ | (Amounts in thousands)
Cash on deposit | ​ | $ | 11,592 | ​ | $ | 11,592 | ​ | $ | — | ​ | $ | — | ​ | $ | 65 | ​ | $ | 65 | ​ | $ | — | ​ | $ | —
Fixed income | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10,388 | ​ | ​ | 8,714 | ​ | ​ | 1,674 | ​ | ​ | —
Equity | ​ |  | — | ​ |  | — | ​ | ​ | — | ​ | ​ | — | ​ |  | 913 | ​ |  | 263 | ​ | ​ | 650 | ​ | ​ | —
Total plan assets | ​ | $ | 11,592 | ​ | $ | 11,592 | ​ | $ | — | ​ | $ | — | ​ | $ | 11,366 | ​ | $ | 9,042 | ​ | $ | 2,324 | ​ | $ | —

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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