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Leases - Narrative (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
USD ($)
location
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Number of lease contracts | location 9  
Number of campuses | location 12  
Operating lease, rent expense including related parties $ 500 $ 500
Operating lease payments due $ 188,932  
Minimum annual rent increase, percent 4.00%  
Number of Properties Subject to Ground Leases | location 2  
John C. White, Property One    
Lessee, Lease, Description [Line Items]    
Operating lease payments due $ 300  
John C. White, Property Two    
Lessee, Lease, Description [Line Items]    
Operating lease payments due $ 700  
Minimum    
Lessee, Lease, Description [Line Items]    
Lease term 8 years  
Maximum    
Lessee, Lease, Description [Line Items]    
Lease term 20 years