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Pension and Retirement Plans - Components of net periodic benefit costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
(Decrease) increase in minimum liability included in other comprehensive income (loss) | $ 60 | $ (244)
United Kingdom |  |
Defined Benefit Plan Disclosure [Line Items] |  |
(Decrease) increase in minimum liability included in other comprehensive income (loss) | (106) | (313)
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
(Decrease) increase in minimum liability included in other comprehensive income (loss) | 166 | 69
Pension: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 451 | 442
Expected return on plan assets | (515) | (575)
Amortization of past service costs | 8 | 7
Amortization of net gain | (5) | (4)
Net periodic (benefit) cost | (61) | (130)
(Decrease) increase in minimum liability included in other comprehensive income (loss) | (100) | (314)
Pension: | Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 440 | 429
Pension: | United Kingdom |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 440 | 429
Expected return on plan assets | (515) | (575)
Amortization of past service costs | 8 | 7
Amortization of net gain | 0 | 0
Net periodic (benefit) cost | (67) | (139)
(Decrease) increase in minimum liability included in other comprehensive income (loss) | (106) | (313)
Pension: | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 11 | 13
Expected return on plan assets | 0 | 0
Amortization of past service costs | 0 | 0
Amortization of net gain | (5) | (4)
Net periodic (benefit) cost | 6 | 9
(Decrease) increase in minimum liability included in other comprehensive income (loss) | 6 | (1)
Post Retirement: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 23 | 24
Interest cost | 64 | 62
Amortization of net gain | (172) | (196)
Net periodic (benefit) cost | (85) | (110)
(Decrease) increase in minimum liability included in other comprehensive income (loss) | 160 | 70
Post Retirement: | Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 0 | 0
Post Retirement: | United Kingdom |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 0 | 0
Amortization of net gain | 0 | 0
Net periodic (benefit) cost | 0 | 0
(Decrease) increase in minimum liability included in other comprehensive income (loss) | 0 | 0
Post Retirement: | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 23 | 24
Interest cost | 64 | 62
Amortization of net gain | (172) | (196)
Net periodic (benefit) cost | (85) | (110)
(Decrease) increase in minimum liability included in other comprehensive income (loss) | $ 160 | $ 70

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A 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 1 -Subparagraph (h)(5) -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 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A 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 1 -Subparagraph (h)(3) -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 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A 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 1 -Subparagraph (a)(2) -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 (h)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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