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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Summary of Significant Accounting Policies                        
Revenues $ 268,931 $ 257,154 $ 257,559 $ 257,121 $ 256,314 $ 253,252 $ 254,872 $ 251,314 $ 1,040,765 $ 1,015,752 $ 917,734  
Percentage of impact on total revenue                   0.60% 0.40% 0.30%
School operating losses included in the entity's revenue                 $ 45,400 $ 54,700 $ 66,700  
Minimum                        
Summary of Significant Accounting Policies                        
Duration of contracts providing access to curriculum via the entity's Web site                 1 year      
Maximum                        
Summary of Significant Accounting Policies                        
Duration of contracts providing access to curriculum via the entity's Web site                 2 years      
Primary Obligor                        
Summary of Significant Accounting Policies                        
Revenues                 $ 325,500 $ 342,700 $ 314,800