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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Revenue recognition        
Amounts recorded as revenues and school operating expenses $ 89.1us-gaap_CostOfReimbursableExpense $ 71.3us-gaap_CostOfReimbursableExpense $ 241.9us-gaap_CostOfReimbursableExpense $ 190.8us-gaap_CostOfReimbursableExpense
Reduction in school operating losses included in the entity's revenue $ 12.5lrn_RevenueReductionSchoolOperatingLosses $ 14.1lrn_RevenueReductionSchoolOperatingLosses $ 45.2lrn_RevenueReductionSchoolOperatingLosses $ 39.8lrn_RevenueReductionSchoolOperatingLosses
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