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Equity Compensation Plans (Tables) | 6 Months Ended
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Nov. 30, 2020
Stock Option Activity | A summary of stock option activity during the six months ended November 30, 2020 follows:
|  |  |  |  | Weighted- |
|  |  |  |  | Average |
(Options in thousands) |  | Shares |  |  | Exercise Price |
Options outstanding June 1, 2020 |  |  | 2,162 |  |  | $ | 55.96 |
Granted |  |  | 202 |  |  |  | 68.47 |
Exercised |  |  | (294 | ) |  |  | 42.04 |
Forfeited |  |  | (160 | ) |  |  | 57.26 |
Options outstanding November 30, 2020 |  |  | 1,910 |  |  | $ | 59.29 |
Fair Value of Stock Options Granted Estimated Weighted-Average Assumptions | The fair value of stock options granted was estimated using the following weighted-average assumptions.
|  | FY 2021
Risk-free interest rate |  | 0.2%
Expected dividend yield |  | 0.0%
Expected stock price volatility |  | 31.3%
Expected option life |  | 3.25 years

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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year. + 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 Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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