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Revenues - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Returns liability | $ 43.5 | $ 34.5
Returns asset | 2.7 | 1.6
Deferred revenue | $ 121.8 | $ 107.2

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- Definition Returns Asset + References No definition available. + Details
Name: | schl_ReturnsAsset
Namespace Prefix: | schl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Returns Liability + References No definition available. + Details
Name: | schl_ReturnsLiability
Namespace Prefix: | schl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration