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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Summary of Significant Accounting Policies        
Revenues $ 392,145 $ 257,154 $ 1,139,250 $ 771,834
School operating losses included in the entity's revenue 13,800 11,000 $ 57,900 38,500
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 $ 105,800 $ 78,300 $ 317,900 $ 247,700