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Earnings (Loss) Per Share (Details) (USD $) Share data in Millions, unless otherwise specified | 9 Months Ended
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Feb. 28, 2015 | Feb. 28, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 9,900,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |
Participating Restricted Stock Units [Member] |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Undistributed Earnings Allocated to Participating Securities | $ 0.1 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic / us-gaap_StatementClassOfStockAxis = schl_ParticipatingRestrictedStockUnitsMember | $ 0.1 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic / us-gaap_StatementClassOfStockAxis = schl_ParticipatingRestrictedStockUnitsMember

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 + Details
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