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Stockholders' Equity - Narrative (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 03, 2022 shares | Oct. 29, 2014 vote $ / shares shares | May 31, 2023 USD ($) working_hour Employees $ / shares shares | May 31, 2022 USD ($) $ / shares shares | May 31, 2021 USD ($) $ / shares shares | May 31, 2020 shares | May 31, 2018 shares
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Authorized capital stock (shares) |  | 80,000,000 |  |  |  |  |
Shares of common stock (shares) |  | 75,000,000 | 75,000,000 | 75,000,000 |  |  |
Common stock, par value (usd per share) | $ / shares |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares authorized (shares) |  | 5,000,000 | 5,000,000 | 5,000,000 |  |  |
Preferred stock, par value (usd per share) | $ / shares |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |
Common stock, votes per share | vote |  | 1 |  |  |  |  |
Option grants in the period, weighted average grant date fair value (usd per share) | $ / shares |  |  | $ 9.27 | $ 9.57 | $ 3.97 |  |
Risk free interest rate |  |  | 3.20% | 0.92% | 0.34% |  |
Expected volatility rate |  |  | 44.00% | 41.00% | 39.00% |  |
Expected term |  |  | 5 years 1 month 20 days | 5 years 18 days | 4 years 11 months 15 days |  |
The total intrinsic value of options exercised | $ |  |  | $ 200,000 | $ 1,600,000 | $ 800,000 |  |
Compensation not yet recognized | $ |  |  | 3,900,000 |  |  |  |
Proceeds from stock options exercised | $ |  |  | 300,000 | 2,700,000 | 1,900,000 |  |
Tax benefit | $ |  |  | $ 2,600,000 | $ 2,500,000 | $ 2,000,000 |  |
Grants in the period, weighted average grant date fair value (usd per share) | $ / shares |  |  |  | $ 26.24 | $ 10.40 |  |
Average price of share issued | $ / shares |  |  | $ 13.67 | $ 19.02 | $ 7.95 |  |
Period of recognition for costs not yet recognized (years) |  |  | 2 years |  |  |  |
Employee Stock Option |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Percentage of grants to employees vesting |  |  | 25.00% |  |  |  |
Option grants to employees vesting period |  |  | 4 years |  |  |  |
Tax benefit | $ |  |  | $ 0 | $ 0 | $ 0 |  |
Period of recognition for costs not yet recognized (years) |  |  | 4 years |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |
Grants in the period, weighted average grant date fair value (usd per share) | $ / shares |  |  | $ 19.99 |  |  |  |
Employee service, compensation cost not yet recognized | $ |  |  | $ 9,100,000 |  |  |  |
Nonvested compensation, weighted average grant date fair value (usd per share) | $ / shares |  |  |  | $ 18.36 |  |  |
Nonvested compensation (shares) |  |  | 736,020 | 670,017 |  |  |
Period of recognition for costs not yet recognized (years) |  |  | 2 years |  |  |  |
Service period |  |  | 4 years |  |  |  |
Performance Share and Restricted Stock Unit Awards |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Total fair value of restricted stock awards vesting | $ |  |  | $ 5,600,000 | $ 8,500,000 | $ 2,100,000 |  |
Performance Shares |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Compensation not yet recognized | $ |  |  | $ 2,400,000 |  |  |  |
Vesting period |  |  | 3 years |  |  |  |
Nonvested compensation, weighted average grant date fair value (usd per share) | $ / shares |  |  | $ 23.71 | $ 28.93 | $ 9.72 |  |
Performance period |  |  | 3 years |  |  |  |
Period of recognition for costs not yet recognized (years) |  |  | 1 year |  |  |  |
2004 Stock and Incentive Award Plan |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Total number of common stock available to be issued (shares) |  |  | 2,900,000 |  |  |  |
Stock Purchase Plan |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Total number of common stock available to be issued (shares) |  |  | 3,200,000 |  |  |  |
Maximum number of shares to be offered |  |  | 5,000,000 |  |  |  |
Share purchase periods | Employees |  |  | 2 |  |  |  |
Duration of purchase of shares |  |  | 6 months |  |  |  |
Employee eligible in participating in offering period |  |  | 6 months |  |  |  |
Number of working hours to be eligible (working hour) | working_hour |  |  | 20 |  |  |  |
Number of working months to be eligible |  |  | 5 months |  |  |  |
Employees ownership threshold |  |  | 5.00% |  |  |  |
Percentage of fair market value of a share of common stock on the first day of the offering period |  |  | 85.00% |  |  |  |
Percentage of fair market value of a share of common stock on the last day of the offering period |  |  | 85.00% |  |  |  |
Number of additional shares reserved for issuance (shares) |  |  |  | 500,000 |  | 1,000,000 | 500,000
Maximum number of shares to be offered under the Stock Purchase Plan |  |  | 149,778 | 98,586 | 164,194 |  |
Stock And Incentive Award Plan 2020 |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Period Increase (Decrease) | 1,950,000 |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Period Increase (Decrease) | 1,000,000 |  |  |  |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -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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