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Goodwill and Other Intangibles (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Additions | $ 7.0 | $ 2.4 |
Amortization expense | $ 2.5 | 2.2 | $ 1.9
Useful life of intangible assets | 5 years |  |
U.S. Based Book Fair Business [Member] |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Additions | $ 0.2 | 0.5 |
Digital Phonics Business [Member] |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Additions | $ 6.8 |  |
Finite-Lived Intangible Assets [Member] | Troubadour, Limited [Member] |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |
Additions |  | $ 1.9 |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + 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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