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Goodwill and Other Intangibles (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Goodwill | $ 0.0 | $ 6.3 |
Intangible assets acquired | 1.6 | 4.5 |
Amortization expense | $ 3.2 | 2.8 | $ 2.1
Useful life of intangible assets | 5 years 8 months 12 days |  |
U.K. Book Publishing Business [Member] |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Intangible assets acquired | $ 1.6 | $ 3.9 |
U.S. Based Book Fair Business [Member] |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Intangible assets acquired | 0.3 |  |
U.K. Based Book Business [Member] |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Intangible assets acquired | 0.3 |  |
Education [Member] |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Amount of allocated goodwill | $ 66.7 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of goodwill allocated to reporting unit with zero or negative amount of net assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=121556970&loc=SL108378252-109267 + Details
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