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Other Financial Data (Details) - Other Financial Data - Balance Sheet - USD ($) $ in Millions | May 31, 2017 | May 31, 2016 | May 31, 2015 | May 31, 2014
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Other Financial Data - Balance Sheet [Abstract] |  |  |  |
Allowance for royalty advances | $ 93.8 | $ 90.1 |  |
Allowance for doubtful accounts | 13.7 | 16.1 |  |
Unredeemed credits issued in conjunction with the Company’s school-based book club and book fair operations (included in other accrued expenses) | 8.7 | 8.9 |  |
Reserve For Return [Member] |  |  |  |
Other Financial Data - Balance Sheet [Abstract] |  |  |  |
Accounts receivable reserve for returns | $ 36.3 | $ 32.1 | $ 27.9 | $ 27.0

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- Definition A valuation allowance for royalty advances due to an Entity that are expected to be uncollectible. + References No definition available. + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 + Details
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- Definition Value of deferred revenue or cost to provide products or services, which is expected to be recognized in income or incurred within one year or the normal operating cycle, if longer, resulting from customer loyalty program. Excludes liability associated with frequent flier programs. Includes liability associated with customer loyalty programs for other businesses, for example, but is not limited to, hotels, supermarkets, credit card companies, automobile rental companies, and book sellers. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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