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Leases - Additional Information (Details) | 12 Months Ended
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Sep. 30, 2025 USD ($) ft²
Lessee Lease Description [Line Items] |
Boston Lease Square Feet | ft² | 250,000
Boston lease year one payments | $ 11,000,000
Boston lease per square foot annual increase | 1
Boston lease annual increase | 300,000
Boston lease building operating cost amount estimate year one | 8,200,000
Asset Impairment Charges | $ 15,600,000
Leases not yet commenced, Term of contract | 5 years
Future lease payments | $ 7,400,000
Right-of-Use Assets [Member] |
Lessee Lease Description [Line Items] |
Asset Impairment Charges | $ 12,800,000

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