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Impairment and Other Charges (Credits), Net - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Restructuring Cost And Reserve [Line Items] |  |  |
Sublease Income | $ 958 | $ 1,436 | $ 4,749
Restructuring and other charges (credits), net | $ 15,643 | $ (802) | $ (460)

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