v3.26.1
Property and Equipment, net - Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Property, Plant, and Equipment [Line Items]    
Right-of-use assets for finance leases $ 5,603 $ 5,603
Property and equipment, gross 545,816 492,109
Less: Accumulated depreciation and amortization (207,052) (206,257)
Property and equipment, net 338,764 285,852
Land    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross 25,601 25,601
Buildings and building improvements    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 170,813 167,977
Buildings and building improvements | Minimum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 3 years  
Buildings and building improvements | Maximum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 30 years  
Leasehold improvements    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 133,162 101,002
Leasehold improvements | Minimum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 1 year  
Leasehold improvements | Maximum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 20 years  
Training equipment    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 120,854 101,809
Training equipment | Minimum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 3 years  
Training equipment | Maximum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 10 years  
Office and computer equipment    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 42,059 37,105
Office and computer equipment | Minimum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 3 years  
Office and computer equipment | Maximum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 10 years  
Internally developed software    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 0 13,395
Internally developed software | Minimum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 3 years  
Internally developed software | Maximum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 5 years  
Internally developed curriculum    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 0 5,721
Internally developed curriculum | Minimum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 3 years  
Internally developed curriculum | Maximum    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 5 years  
Vehicles    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 5 years  
Property and equipment, gross $ 1,094 1,167
Right-of-use assets for finance leases    
Property, Plant, and Equipment [Line Items]    
Depreciable Lives (in years) 15 years  
Construction in progress    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 46,630 $ 32,729