v3.22.4
Property and Equipment, net- Schedule of property and equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Property, Plant and Equipment [Line Items]    
Right-of-use assets for finance leases $ 2,976 $ 215
Property and equipment and Right-of-use assets for finance leases, gross 435,494 408,717
Less: Accumulated depreciation and amortization (194,658) (194,425)
Property and equipment and Right-of-use assets for finance leases, net 240,836 214,292
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 16,603 16,603
Buildings and building improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 126,373 126,244
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 $ 107,440 86,751
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 $ 106,240 96,907
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 $ 36,238 31,900
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  
Curriculum development    
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 5 years  
Property and equipment, gross $ 20,200 20,130
Software developed for internal use    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 12,307 12,150
Software developed for internal use | Minimum    
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 1 year  
Software developed for internal use | 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 $ 1,406 1,458
Right-of-use assets for finance leases | Minimum    
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 2 years  
Right-of-use assets for finance leases | Maximum    
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 3 years  
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 5,711 $ 16,359