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Pension and Retirement Plans - Changes of the benefit obligation, the plan assets and funded status of the plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets, Beginning Balance | $ 10,034 |
Administrative expenses | (143) |
Fair Value of Plan Assets, Ending Balance | 11,366 | $ 10,034
Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Administrative expenses | (143) |
Pension: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation, beginning of period | 8,278 | 7,987
Interest cost | 451 | 442
Changes in actuarial assumptions | 350 | (321)
Foreign exchange impact | 788 | 759
Benefits paid | (542) | (589)
Projected benefit obligation, end of period | 9,325 | 8,278
Fair Value of Plan Assets, Beginning Balance | 10,034 | 8,825
Actual gain on plan assets | 985 | 628
Company contributions | 54 | 307
Foreign exchange impact | 978 | 863
Benefits paid | (542) | (589)
Fair Value of Plan Assets, Ending Balance | 11,366 | 10,034
Funded status \ net amount recognized | 2,041 | 1,756
Pension: | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation, beginning of period | 202 | 261
Interest cost | 11 | 13
Changes in actuarial assumptions | 1 | (4)
Foreign exchange impact | 0 | 0
Benefits paid | (54) | (68)
Projected benefit obligation, end of period | 160 | 202
Fair Value of Plan Assets, Beginning Balance | 0 | 0
Actual gain on plan assets | 0 | 0
Company contributions | 54 | 68
Foreign exchange impact | 0 | 0
Benefits paid | (54) | (68)
Fair Value of Plan Assets, Ending Balance | 0 | 0
Funded status \ net amount recognized | (160) | (202)
Pension: | Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation, beginning of period | 8,076 | 7,726
Interest cost | 440 | 429
Changes in actuarial assumptions | 349 | (317)
Foreign exchange impact | 788 | 759
Benefits paid | (488) | (521)
Projected benefit obligation, end of period | 9,165 | 8,076
Fair Value of Plan Assets, Beginning Balance | 10,034 | 8,825
Actual gain on plan assets | 985 | 628
Company contributions |  | 239
Foreign exchange impact | 978 | 863
Benefits paid | (488) | (521)
Fair Value of Plan Assets, Ending Balance | 11,366 | 10,034
Funded status \ net amount recognized | 2,201 | 1,958
Post Retirement: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation, beginning of period | 1,147 | 1,186
Service cost | 23 | 24
Interest cost | 64 | 62
Changes in actuarial assumptions | (12) | (125)
Projected benefit obligation, end of period | 1,222 | 1,147
Funded status \ net amount recognized | (1,222) | (1,147)
Post Retirement: | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation, beginning of period | 1,147 | 1,186
Service cost | 23 | 24
Interest cost | 64 | 62
Changes in actuarial assumptions | (12) | (125)
Projected benefit obligation, end of period | 1,222 | 1,147
Funded status \ net amount recognized | (1,222) | (1,147)
Post Retirement: | Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation, beginning of period | 0 | 0
Service cost | 0 | 0
Interest cost | 0 | 0
Changes in actuarial assumptions | 0 | 0
Projected benefit obligation, end of period | 0 | 0
Funded status \ net amount recognized | $ 0 | $ 0

X
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -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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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation 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 1 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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