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Accounting for Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2023 | Nov. 30, 2023 | Aug. 31, 2023 | Nov. 30, 2022 | Nov. 30, 2023 | Nov. 30, 2022
Stock options, additional disclosures |  |  |  |  |  |
Compensation expenses |  |  |  |  | $ 10.3 | $ 2.1
Assumptions used in the Black-Scholes option pricing models to estimate the fair value of each stock option grant |  |  |  |  |  |
Risk-free interest rate |  |  |  |  | 4.10% |
Expected volatility of common stock |  |  |  |  | 42.30% |
Dividend yield |  |  |  |  | 0.00% |
Expected option term in years |  |  |  |  | 5 years 1 month 6 days |
Restricted stock |  |  |  |  |  |
Stock options, additional disclosures |  |  |  |  |  |
Compensation expenses |  | $ 2.9 |  | $ 1.9 | $ 6.3 | 4.9
Performance-based restricted stock |  |  |  |  |  |
Stock options, additional disclosures |  |  |  |  |  |
Granted (in shares) |  |  | 81,100 |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Stock options, additional disclosures |  |  |  |  |  |
Granted (in shares) |  |  | 87,130 |  |  |
Granted (in dollars per share) |  |  | $ 58.27 |  |  |
Stock Appreciation Rights (SARs) | Board of Directors |  |  |  |  |  |
Stock options, additional disclosures |  |  |  |  |  |
Granted (in shares) |  |  | 21,834 |  |  |
Granted (in dollars per share) |  |  | $ 51.51 |  |  |
Employee Stock Option |  |  |  |  |  |
Stock options, additional disclosures |  |  |  |  |  |
Granted (in shares) | 141,545 |  |  |  |  |
Exercise price (in dollars per share) | $ 58.27 |  |  |  |  |
Weighted average fair value of stock options granted (in dollars per share) | $ 25.31 |  |  |  |  |
Total intrinsic value of stock options exercised |  |  |  |  | 13.7 | 2.7
Compensation expenses |  | $ 0.7 |  | $ 0.9 | $ 1.6 | $ 2.0

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- Definition The number of grants made 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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