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Investments (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
May 31, 2014
May 31, 2014
Sep. 15, 2014
Investments (Details) [Line Items]              
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 18,900,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 23,700,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 18,900,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 23,700,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 18,400,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 18,400,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures  
Equity Method Investments 18,900,000us-gaap_EquityMethodInvestments 18,900,000us-gaap_EquityMethodInvestments 18,900,000us-gaap_EquityMethodInvestments 18,900,000us-gaap_EquityMethodInvestments 18,400,000us-gaap_EquityMethodInvestments 18,400,000us-gaap_EquityMethodInvestments  
Gain (Loss) on Investments (600,000)us-gaap_GainLossOnInvestments 0us-gaap_GainLossOnInvestments (600,000)us-gaap_GainLossOnInvestments 0us-gaap_GainLossOnInvestments 4,800,000us-gaap_GainLossOnInvestments    
Income (Loss) from Equity Method Investments     1,700,000us-gaap_IncomeLossFromEquityMethodInvestments 1,800,000us-gaap_IncomeLossFromEquityMethodInvestments      
UK Non-controlling              
Investments (Details) [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent 15.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_StatementBusinessSegmentsAxis
= schl_UKNoncontrollingMember
  15.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_StatementBusinessSegmentsAxis
= schl_UKNoncontrollingMember
      15.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_StatementBusinessSegmentsAxis
= schl_UKNoncontrollingMember
Payments for (Proceeds from) Investments             0.6schl_Proceedsforcostbasisinvestments
/ us-gaap_StatementBusinessSegmentsAxis
= schl_UKNoncontrollingMember
UK Equity-method              
Investments (Details) [Line Items]              
Equity Method Investment, Ownership Percentage 26.20%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= schl_UKEquitymethodMember
  26.20%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= schl_UKEquitymethodMember
       
Software Development Business              
Investments (Details) [Line Items]              
Equity Method Investment, Ownership Percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= schl_SoftwareDevelopmentBusinessMember
  20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= schl_SoftwareDevelopmentBusinessMember
       
Equity Method Investments 1,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= schl_SoftwareDevelopmentBusinessMember
  1,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= schl_SoftwareDevelopmentBusinessMember
       
Equity Method Investment, Other than Temporary Impairment           $ 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= schl_SoftwareDevelopmentBusinessMember