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Pension and Retirement Plans - Components of net periodic benefit costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ (150) | $ 1,063
U.K. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (231) | 914
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | 81 | 149
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 278 | 386
Expected return on plan assets | (289) | (327)
Amortization of past service costs | 7 |
Amortization of net gain (loss) | 193 | 146
Net periodic benefit cost | 189 | 205
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (229) | 932
Pension | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 263 | 362
Pension | U.K. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 263 | 362
Expected return on plan assets | (289) | (327)
Amortization of past service costs | 7 |
Amortization of net gain (loss) | 190 | 149
Net periodic benefit cost | 171 | 184
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (231) | 914
Pension | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 15 | 24
Amortization of net gain (loss) | 3 | (3)
Net periodic benefit cost | 18 | 21
Increase (decrease) in minimum liability included in other comprehensive income (loss) | 2 | 18
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 38 | 34
Interest cost | 46 | 53
Amortization of net gain (loss) | 24 | (20)
Net periodic benefit cost | 108 | 67
Increase (decrease) in minimum liability included in other comprehensive income (loss) | 79 | 131
Post Retirement | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 38 | 34
Interest cost | 46 | 53
Amortization of net gain (loss) | 24 | (20)
Net periodic benefit cost | 108 | 67
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ 79 | $ 131

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of 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)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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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=118257860&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=118255775&loc=d3e1928-114920 Reference 3: 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=118255775&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=118257860&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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: 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=118255775&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=118255775&loc=d3e1928-114920 Reference 2: 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=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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=118255775&loc=d3e2709-114920 + Details
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