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Equity Compensation Plans (Tables) | 6 Months Ended
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Nov. 30, 2022
Summary of Stock Option Activity | A summary of stock option activity during the six months ended November 30, 2022 follows:
(options in thousands) |  | Shares |  |  | Weighted- Average Exercise Price |
Options outstanding June 1, 2022 |  |  | 3,244 |  |  | $ | 32.13 |
Granted |  |  | 1,687 |  |  |  | 14.63 |
Exercised |  |  | (4 | ) |  |  | 10.75 |
Forfeited/Expired |  |  | (592 | ) |  |  | 29.75 |
Options outstanding November 30, 2022 |  |  | 4,335 |  |  | $ | 25.66 |
Summary of 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 2023 |  |  | FY 2022 |
Risk-free interest rate |  |  | 3.3 | % |  |  | 0.4 | %
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Expected stock price volatility |  |  | 34.0 | % |  |  | 32.8 | %
Expected option life |  |  | 4.61 years |  |  |  | 3.12 years |
Schedule of Nonvested Restricted Stock Units Activity | A summary of RSU activity during the six months ended November 30, 2022 follows:
(RSUs in thousands) |  | Shares |  |  | Weighted- Average Fair Value |
RSUs outstanding June 1, 2022 |  |  | 257 |  |  | $ | 36.14 |
Granted |  |  | 584 |  |  |  | 13.72 |
Released |  |  | (47 | ) |  |  | 37.62 |
Forfeited/Cancelled |  |  | (5 | ) |  |  | 37.63 |
RSUs outstanding November 30, 2022 |  |  | 789 |  |  | $ | 19.46 |

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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