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Defined Benefit Pension Plan - Additional Information (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2019 GBP (£) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Net periodic benefit cost recognized |  |  |  |  |  |
Interest cost | $ 618 | $ 651 | $ 582 |  |  |
Expected return on plan assets | (965) | (986) | (826) |  |  |
Total net periodic benefit | (347) | (335) | (244) |  |  |
Change in benefit obligation |  |  |  |  |  |
Beginning balance | 22,226 | 25,085 |  |  |  |
Interest cost | 618 | 651 | 582 |  |  |
Benefits paid | (879) | (2,297) |  |  |  |
Actuarial loss/(gain) | 2,508 | (590) |  |  |  |
Foreign currency exchange rate changes | (1,233) | (623) |  |  |  |
Ending balance | 23,240 | 22,226 | 25,085 |  |  |
Change in plan assets |  |  |  |  |  |
Beginning balance at fair value | 25,132 | 26,943 |  |  |  |
Actual return on plan assets | 3,003 | 1,175 |  |  |  |
Benefits paid | (879) | (2,297) |  |  |  |
Employer's contributions | 0 | 0 |  |  |  |
Foreign currency exchange rate changes | (1,477) | (689) |  |  |  |
Ending balance at fair value | 25,779 | 25,132 | 26,943 |  |  |
Overfunded status of the Scheme |  |  |  |  | $ 2,539 | $ 2,906
Benefit obligation | 22,226 | 22,226 | 25,085 |  | $ 23,240 | $ 22,226
Accumulated OCI |  |  |  |  |  |
Accumulated other comprehensive (income) loss at beginning of year | (892) | (123) |  |  |  |
Net actuarial gain (loss) | 540 | (773) |  |  |  |
Foreign currency translation adjustments | 49 | 4 |  |  |  |
Accumulated other comprehensive (income) loss at end of year | $ (303) | $ (892) | $ (123) |  |  |
Defined Benefit Plan, Assumptions Used in Calculations [Abstract] |  |  |  |  |  |
Discount rate to determine net periodic (benefit) cost (as a percentage) | 2.90% | 2.70% |  |  |  |
Expected return on plan assets (as a percentage) | 4.00% | 3.80% |  |  |  |
Discount rate to determine benefit obligations (as a percentage) |  |  |  | 1.80% | 1.80% | 2.90%
Rate of increases to deferred CPI linked benefits (as a percentage) | 2.10% | 2.20% |  |  |  |
Rate of increases to deferred RPI linked benefits (as a percentage) | 3.20% | 3.30% |  |  |  |
Defined benefit plan long term rate of improvement (as a percentage) | 1.30% |  |  |  |  |
Expected benefit payments over the next 10 years |  |  |  |  |  |
2020 |  |  |  |  | $ 750 |
2021 |  |  |  |  | 705 |
2022 |  |  |  |  | 828 |
2023 |  |  |  |  | 1,112 |
2024 |  |  |  |  | 964 |
2025 through 2029 |  |  |  |  | 4,779 |
Total |  |  |  |  | $ 9,138 |
Information about plan assets |  |  |  |  |  |
Actual (as a percent) |  |  |  | 100.00% | 100.00% | 100.00%
Maximum |  |  |  |  |  |
Defined benefit pension plan |  |  |  |  |  |
Expected contributions | £ |  |  |  | £ 10,000,000 |  |
Males |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used in Calculations [Abstract] |  |  |  |  |  |
Defined benefit plan mortality rate (as a percentage) | 105.00% |  |  |  |  |
Females |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used in Calculations [Abstract] |  |  |  |  |  |
Defined benefit plan mortality rate (as a percentage) | 105.00% |  |  |  |  |
Equity securities |  |  |  |  |  |
Information about plan assets |  |  |  |  |  |
Actual (as a percent) |  |  |  | 19.70% | 19.70% | 45.70%
Corporate bonds |  |  |  |  |  |
Information about plan assets |  |  |  |  |  |
Actual (as a percent) |  |  |  | 56.40% | 56.40% | 53.10%
Diversified fund |  |  |  |  |  |
Information about plan assets |  |  |  |  |  |
Actual (as a percent) |  |  |  | 23.50% | 23.50% | 0.00%
Cash |  |  |  |  |  |
Information about plan assets |  |  |  |  |  |
Actual (as a percent) |  |  |  | 0.40% | 0.40% | 1.20%

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- Definition Represents the rate of increases to deferred Retail Prices Index (RPI) linked benefits which is an actuarial assumption used to determine the benefit obligations and the net periodic benefit cost. + References No definition available. + Details
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- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -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 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -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 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -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 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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