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Restructuring Charges - Restructuring Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Restructuring Cost and Reserve [Line Items] |  |
Accrued expenses (Beginning balance) | $ 0 | $ 3,496
Severance Costs, Including Other Adjustments | 11,321 | 8,472
Payments for Restructuring | (9,208) | (9,510)
Accrued expenses (Ending balance) | $ 2,113 | $ 2,458

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