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Restructuring Charges - Restructuring Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Restructuring Cost and Reserve [Line Items] |  |
Accrued expenses (Beginning balance) | $ 3,496 | $ 0
Severance Costs, Including Other Adjustments | 8,472 | 8,740
Payments for Restructuring | (9,510) | (6,354)
Accrued expenses (Ending balance) | $ 2,458 | $ 2,386

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