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Restructuring Charges - Restructuring Activity (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Restructuring Cost and Reserve [Line Items] |  |
Accrued expenses (Beginning balance) | $ 0 | $ 0
Accrued expenses (Ending balance) | 8,373 | 220
Q1 2023 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance Costs | 8,740 |
Cash payments: | (8,740) |
Q3 2023 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance Costs | 53,193 |
Cash payments: | $ (44,820) |
Q1 2022 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance Costs |  | 7,909
Cash payments: |  | $ (7,689)

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-17 + Details
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