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Property and Equipment Net (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 229,536 $ 219,862
Less accumulated depreciation and amortization (137,403) (127,923)
Property and equipment, net 92,133 91,939
Land
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,456 1,456
Building and building improvements
   
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 35 years  
Property and equipment, gross 13,675 13,675
Leasehold improvements
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 47,802 47,185
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 82,217 79,952
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 39,756 39,656
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  
Software developed for internal use
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 10,895 11,048
Software developed for internal use | Minimum
   
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 3 years  
Software developed for internal use | Maximum
   
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 5 years  
Curriculum development
   
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 5 years  
Property and equipment, gross 18,716 18,716
Vehicles
   
Property, Plant and Equipment [Line Items]    
Depreciable Lives (in years) 5 years  
Property and equipment, gross 973 949
Construction in Progress
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 14,046 $ 7,225