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Revenues - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2019 | Nov. 30, 2018 | May 31, 2019
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Returns liability | $ 42,400,000 | $ 78,700,000 | $ 42,400,000 | $ 78,700,000 | $ 34,500,000
Return asset | 2,600,000 | 9,400,000 | 2,600,000 | 9,400,000 | $ 1,600,000
Amount of revenue recognized included within deferred revenue balance | $ 46,900,000 | $ 30,800,000 | $ 74,000,000.0 | $ 62,700,000 |

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- Definition Contract with Customer, Liability, Portion of Recognized Revenue Included in Balance + References No definition available. + Details
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Namespace Prefix: | schl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=108792157&loc=SL49130611-203046-203046 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of right to recover product from customer on settling refund liability, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=108792157&loc=SL49130611-203046-203046 + Details
Name: | us-gaap_ContractWithCustomerRightToRecoverProductCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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