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Revenues - Disaggregation of Revenue Data (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1,653.9 | $ 1,628.4 | $ 1,741.6
Childrens Book Publishing And Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 990.3 | 970.2 |
Childrens Book Publishing And Distribution | Book Clubs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 212.4 | 224.3 |
Childrens Book Publishing And Distribution | Book Fairs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 499.6 | 513.6 |
Childrens Book Publishing And Distribution | Trade [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 278.3 | 232.3 |
Education |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 297.4 | 288.6 |
International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 366.2 | 369.6 |
International | Major Markets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 254.9 | 258.3 |
International | Other Markets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 111.3 | $ 111.3 |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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