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Property and Equipment, net (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 285,952 $ 284,390
Less accumulated depreciation and amortization (166,206) (160,246)
Property and equipment, net 119,746 124,144
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,189 3,189
Buildings and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 78,704 79,555
Buildings and Building Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 30 years  
Buildings and Building Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 35 years  
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 39,172 39,326
Leasehold improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 1 year  
Leasehold improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 28 years  
Training equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 91,603 87,795
Training equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 3 years  
Training equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 10 years  
Office and computer equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 38,362 38,776
Office and computer equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 3 years  
Office and computer equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 10 years  
Software developed for internal use [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 11,694 11,859
Software developed for internal use [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 3 years  
Software developed for internal use [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 5 years  
Curriculum development [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 5 years  
Property and equipment, gross $ 18,702 18,716
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Depreciable Lives 5 years  
Property and equipment, gross $ 1,237 1,233
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 3,289 $ 3,941