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Fair Value Disclosures - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Fair Value Disclosures [Abstract] |  |  |
Marketable securities purchased | $ 0.0 | $ 143.9 | $ 171.3

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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 + Details
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