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Summary of Significant Accounting Policies - Property and Equipment and Leases (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 01, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jan. 27, 2020
Property and equipment            
Depreciation expense   $ 5,700,000 $ 4,900,000 $ 16,200,000 $ 15,200,000  
Equipment expense   700,000 700,000 3,900,000 4,000,000.0  
Capitalized software development costs       $ 18,825,000 20,580,000  
Capitalized Curriculum Development Costs            
Estimated useful life of the software       5 years    
Capitalized curriculum development additions       $ 15,463,000 13,746,000  
Amortization expense   4,500,000 4,500,000 13,300,000 13,500,000  
Finance Leases            
Purchase option   $ 1   $ 1    
Operating Leases            
Incremental borrowing rate used as discount rate 3.86%         2.55%
Minimum            
Finance Leases            
Finance lease term   1 year   1 year    
Operating Leases            
Operating leases initial term   1 year   1 year    
Operating lease remaining lease term 1 year          
Maximum            
Finance Leases            
Finance lease term   3 years   3 years    
Operating Leases            
Operating leases initial term   11 years   11 years    
Operating lease remaining lease term 5 years          
Student computers            
Property and equipment            
Accelerated depreciation   $ 500,000 500,000 $ 1,800,000 1,600,000  
Student computers | Minimum            
Property and equipment            
Useful Life       3 years    
Student 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 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    
Amortization expense   $ 6,400,000 $ 7,000,000.0 $ 20,000,000.0 $ 22,400,000  
Buildings | Minimum            
Operating Leases            
Operating leases initial term   1 year   1 year    
Buildings | Maximum            
Operating Leases            
Operating leases initial term   15 years   15 years