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Investments (Details) - Schedule of cost and equity method investments (USD $)
In Millions, unless otherwise specified
Feb. 28, 2015
May 31, 2014
Feb. 28, 2014
Equity method investments:      
Equity method investments $ 18.6us-gaap_EquityMethodInvestments $ 18.4us-gaap_EquityMethodInvestments $ 19.4us-gaap_EquityMethodInvestments
Total 18.6us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 18.4us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 19.4us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
UK Equity-method      
Equity method investments:      
Equity method investments 18.6us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= schl_UKEquitymethodMember		 18.3us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= schl_UKEquitymethodMember		 18.3us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= schl_UKEquitymethodMember
Software Development Business      
Equity method investments:      
Equity method investments $ 0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= schl_SoftwareDevelopmentBusinessMember		 $ 0.1us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= schl_SoftwareDevelopmentBusinessMember		 $ 1.1us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= schl_SoftwareDevelopmentBusinessMember