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Stock-Based Compensation Plans (Other Information Pertaining to Restricted Stock Awards) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Time-Based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant-date fair value per share | $ 84.46 |  | $ 69.80 | $ 57.50
Total grant-date fair value of shares vested | $ 3.2 |  | $ 3.0 | $ 3.0
Performance-Based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant-date fair value per share | $ 80.59 | [1] | $ 65.17 | $ 53.08
Total grant-date fair value of shares vested | $ 5.8 |  | $ 5.3 | $ 6.6
[1] | For performance-based shares, granted number assumes achievement of performance goals at target. Actual number of shares to be earned may differ from this amount.

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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