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Pension Plans - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Amortization Of Acquired Intangible Assets Excluding Purchased Software | Amortization Of Acquired Intangible Assets Excluding Purchased Software | Amortization Of Acquired Intangible Assets Excluding Purchased Software
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Restructuring Costs and Asset Impairment Charges | Restructuring Costs and Asset Impairment Charges | Restructuring Costs and Asset Impairment Charges
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Interest cost of projected benefit obligation | $ 2,126 | $ 550 | $ 692
Service cost | 690 | 1,016 | 1,127
Expected return on plan assets | (3,541) | (3,712) | (3,643)
Amortization of prior service cost | 0 | (4) | (5)
Recognized actuarial loss | 241 | 1,425 | 4,139
Settlement gain | 0 | (82) | 0
Net periodic pension (benefit) cost | $ (484) | $ (807) | $ 2,310

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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 -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 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -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 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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