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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Property and equipment                  
Equipment expense           $ 4,100 $ 3,400   $ 3,500
Capitalized software development costs           26,318 24,533 $ 26,918  
Net income $ 9,347 $ 13,043 $ 13,189   $ (8,159) $ 37,209 27,420 (459)  
Capitalized Curriculum Development Costs                  
Estimated useful life of the software           5 years      
Capitalized curriculum development costs           $ 16,611 9,927 $ 19,132  
Out of period adjustment                  
Property and equipment                  
Capitalized software development costs       $ 2,300          
Net income       1,400          
Capitalized Curriculum Development Costs                  
Capitalized curriculum development costs       600          
Capitalized curriculum development costs write down       $ 600          
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      
Student computers                  
Property and equipment                  
Accelerated depreciation           $ 2,300 2,100   3,500
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 costs                  
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      
Capitalized software development additions           $ 26,300 $ 24,500   $ 26,900