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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Revenue recognition        
Amounts recorded as revenues and school operating expenses $ 76.1 $ 74.9 $ 139.6 $ 137.4
Reduction in school operating losses included in the entity's revenue $ 13.7 $ 12.6 $ 31.5 $ 28.3
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