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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Revenue recognition        
Amounts recorded as revenues and school operating expenses $ 314.8 $ 292.0 $ 294.7  
Percentage of impact on total revenue   (0.30%) (0.10%) 0.40%
Reduction in school operating losses included in the entity's revenue $ 66.7 $ 61.0 $ 57.1  
Minimum        
Revenue recognition        
Duration of contracts providing access to curriculum via the entity's Web site 1 year      
Maximum        
Revenue recognition        
Duration of contracts providing access to curriculum via the entity's Web site 2 years