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Other Financial Data (Details) - Other Financial Data - Balance Sheet - USD ($) $ in Millions | May 31, 2018 | May 31, 2017 | May 31, 2016 | May 31, 2015
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Other Financial Data - Balance Sheet [Abstract] |  |  |  |
Allowance for royalty advances | $ 97.0 | $ 93.8 |  |
Allowance for doubtful accounts | 12.4 | 13.7 |  |
Reserve For Return [Member] |  |  |  |
Other Financial Data - Balance Sheet [Abstract] |  |  |  |
Accounts receivable reserve for returns | $ 30.0 | $ 36.3 | $ 32.1 | $ 27.9

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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