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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Property and equipment          
Depreciation expense $ 4,800   $ 5,500 $ 13,700 $ 14,100
Peripheral equipment write down 800   700 3,300 3,400
Capitalized software development costs       18,852 19,345
Net income 13,043   8,882 $ 18,073 6,144
Capitalized Curriculum Development Costs          
Estimated useful life of the software       5 years  
Capitalized curriculum development additions       $ 7,770 12,427
Amortization expense 4,700   5,200 14,800 14,800
Out of period adjustment          
Property and equipment          
Capitalized software development costs   $ 2,300      
Net income   1,400      
Capitalized Curriculum Development Costs          
Capitalized curriculum development additions   $ 600      
Student and state testing computers          
Property and equipment          
Accelerated Depreciation 800   1,800 $ 1,700 2,800
Student and state testing computers | Minimum          
Property and equipment          
Useful Life       3 years  
Student and state testing computers | Maximum          
Property and equipment          
Useful Life       5 years  
Computer hardware          
Property and equipment          
Useful Life       3 years  
Computer software | Minimum          
Property and equipment          
Useful Life       3 years  
Computer software | Maximum          
Property and equipment          
Useful Life       5 years  
Web site development          
Property and equipment          
Useful Life       3 years  
Office equipment          
Property and equipment          
Useful Life       5 years  
Furniture and fixtures          
Property and equipment          
Useful Life       7 years  
Leasehold improvements | Minimum          
Property and equipment          
Useful Life       3 years  
Leasehold improvements | Maximum          
Property and equipment          
Useful Life       12 years  
Capitalized software          
Property and equipment          
Useful Life       3 years  
Amortization expense $ 8,200   $ 8,400 $ 26,900 $ 25,200