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Equity Transactions (Details 4) (Restricted Stock, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Stock option plan        
Unrecognized compensation $ 19.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   $ 19.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Weighted average period for recognition of total unrecognized compensation expense related to unvested restricted stock awards granted     1 year 10 months 24 days  
Fair value of share-based compensation awards vested in period     7.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue  
Chief Executive Officer and other Employees
       
Stock option plan        
Stock based compensation expense 3.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= lrn_ChiefExecutiveOfficerAndOtherEmployeesMember
3.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= lrn_ChiefExecutiveOfficerAndOtherEmployeesMember
10.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= lrn_ChiefExecutiveOfficerAndOtherEmployeesMember
11.6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= lrn_ChiefExecutiveOfficerAndOtherEmployeesMember
Vesting Based on Performance | Chief Executive Officer and other Employees
       
Stock option plan        
Stock based compensation expense       $ 2.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= lrn_ChiefExecutiveOfficerAndOtherEmployeesMember
/ lrn_VestingCriteriaAxis
= lrn_VestingBasedOnPerformanceMember