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Leases - Additional Information (Details)
Feb. 08, 2022
USD ($)
renewalOption
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Lessee, Lease, Description [Line Items]      
Restricted cash in connection with operating leases   $ 8,000,000.0 $ 7,800,000
New campus lease lessee option term for construction of fifth building 6 years    
New campus rent abatement period (in months) 10 months    
New campus lease monthly base rent per square foot (in sq ft) $ 6    
New campus lease annual rent escalation (as a percent) 3.00%    
New campus lease term (in years) 13 years 7 months    
New campus lease number of renewal options | renewalOption 2    
New campus lease renewal term (in years) 5 years    
Wells Fargo Bank, N.A.      
Lessee, Lease, Description [Line Items]      
Restricted cash in connection with operating leases   $ 7,800,000