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Restructuring Charges - Restructuring Activity (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |
Accrued expenses (Beginning balance) | $ 3,496 | $ 0
Severance Costs, Including Other Adjustments | 8,655 | 61,933
Payments for Restructuring | (11,615) | (53,560)
Accrued expenses (Ending balance) | $ 536 | $ 8,373

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