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Pension Plans - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Weighted average interest crediting rate used in only cash balance pension plan |  | 6.00% |  |
Defined benefit plan, plan assets, increase (decrease) for actual return (loss) |  | $ (3,000) | $ 3,500 | $ 1,000
Defined benefit plan, plan assets, contributions by employer |  | $ 2,600 | $ 2,600 | $ 2,500
Scenario Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic pension cost | $ 2,300 |  |  |
Defined benefit plan, plan assets, contributions by employer | 3,500 |  |  |
Defined benefit plan, plan assets, contributions by employer, directly to plans | $ 800 |  |  |
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30, Rate of return on plan assets |  | 5.40% | 5.40% | 5.40%
Net periodic pension cost |  | $ 1,924 | $ 1,198 | $ 912
Defined benefit plan, plan assets, increase (decrease) for actual return (loss) |  | (2,990) | 3,512 |
Defined benefit plan, plan assets, contributions by employer |  | $ 2,622 | $ 2,576 |
Pension Plan | Foreign Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current asset allocation target for fixed income securities |  | 100.00% |  |
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plans, vesting period |  | 1 year |  |
Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plans, vesting period |  | 5 years |  |

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- Definition Defined benefit plan, plan assets, contributions by employer, directly to plans. + References No definition available. + Details
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- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Fixed Income Securities + 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://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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- Definition Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + 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 (k)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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