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Property and Equipment, net - Schedule of Property and Equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross   $ 305,657
Right-of-use assets for finance leases $ 359  
Property and equipment and Right-of-use assets for finance leases, gross 255,106  
Less: accumulated depreciation and amortization (182,363)  
Property and equipment, net 72,743  
Less: accumulated depreciation and amortization   (201,531)
Property and equipment, net   104,126
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,189 3,189
Building and building improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 28,046 82,653
Building and building improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 3 years  
Building and building improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 35 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 62,899 53,020
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) 28 years  
Training equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 91,731 96,737
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 $ 33,524 35,927
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]    
Property and equipment, gross $ 19,692 19,692
Software developed for internal use    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 11,951 11,354
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]    
Property and equipment, gross $ 1,502 1,454
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 $ 2,213 $ 1,631