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Pension and Retirement Plans - Components of net periodic benefit costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ (4,096) | $ (1,972)
U.K.. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (3,509) | (1,794)
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (587) | (178)
Pension: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 279 | 254
Expected return on plan assets | (449) | (398)
Amortization of past service costs | 7 | 7
Amortization of net gain (loss) | 98 | 185
Net periodic benefit cost | (65) | 48
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (3,529) | (1,802)
Pension: | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 268 | 243
Pension: | U.K.. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 268 | 243
Expected return on plan assets | (449) | (398)
Amortization of past service costs | 7 | 7
Amortization of net gain (loss) | 97 | 181
Net periodic benefit cost | (77) | 33
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (3,509) | (1,794)
Pension: | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 11 | 11
Amortization of net gain (loss) | 1 | 4
Net periodic benefit cost | 12 | 15
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (20) | (8)
Post Retirement: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 44 | 45
Interest cost | 46 | 42
Amortization of net gain (loss) | (7) | 50
Net periodic benefit cost | 83 | 137
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (567) | (170)
Post Retirement: | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 44 | 45
Interest cost | 46 | 42
Amortization of net gain (loss) | (7) | 50
Net periodic benefit cost | 83 | 137
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ (567) | $ (170)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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