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Restructuring Charges - Restructuring Activity (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Restructuring Cost and Reserve [Line Items] |  |
Accrued expenses (Beginning balance) | $ 0 | $ 3,496
Severance Costs, Including Other Adjustments | 11,321 | 8,655
Payments for Restructuring | (11,274) | (11,615)
Accrued expenses (Ending balance) | $ 47 | $ 536

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