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Capital Stock and Stock-Based Awards - Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended | 49 Months Ended |  |  |  |
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Jul. 19, 2023 | Jul. 21, 2021 | Sep. 26, 2018 | Sep. 24, 2014 | May 31, 2024 | May 31, 2023 | May 31, 2022 | Sep. 30, 2011 | Sep. 21, 2021 | Sep. 30, 2017 | Sep. 21, 2011 | Sep. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock issued (in shares) |  |  |  |  | 0 | 0 |  |  |  |  |  |
Options outstanding ( in shares) |  |  |  |  | 2,942,293 | 3,188,401 |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 37.01 |  |  |  |  |  |  |
Granted (Shares) |  |  |  |  | 272,252 |  |  |  |  |  |  |
Minimum period before grants exercisable |  |  |  |  | 1 year |  |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |
Future period of stock option expense recognition (in years) |  |  |  |  | 1 year 7 months 6 days |  |  |  |  |  |  |
Directors Plan 2017 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding ( in shares) |  |  |  |  | 160,124 |  |  |  |  |  |  |
Common stock remaining authorized (in shares) |  |  |  |  | 132,174 |  |  |  |  |  |  |
Shares reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  | 400,000 |  |
Restricted stock outstanding (in shares) |  |  |  |  | 26,174 |  |  |  |  |  |  |
Plan 2021 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares available for grant (in shares) |  |  |  |  |  |  |  |  | 2,500,000 |  |  |
Options outstanding ( in shares) |  |  |  |  | 831,324 |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 37.01 |  |  |  |  |  |  |
Common stock remaining authorized (in shares) |  |  |  |  | 1,268,955 |  |  |  |  |  |  |
Granted (Shares) |  |  |  |  | 272,252 |  |  |  |  |  |  |
Plan 2011 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares available for grant (in shares) |  |  | 7,115,000 |  |  |  |  |  |  |  | 2,100,000 |
Increase in shares available for grant (in shares) |  |  | 2,540,000 | 2,475,000 |  |  |  |  |  |  |  |
Options outstanding ( in shares) |  |  |  |  | 1,914,266 |  |  |  |  |  |  |
2007 Directors’ Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding ( in shares) |  |  |  |  | 36,579 |  |  |  |  |  |  |
Non-qualified stock options outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3,000
Restricted stock outstanding (in shares) |  |  |  |  |  |  |  | 1,200 |  |  |  |
2017 Outside Director's Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of stock options and restricted stock units granted | $ 125,000 |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expiration of stock options |  |  |  |  | 7 years |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expiration of stock options |  |  |  |  | 10 years |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 4,000,000.0 |  |  |  |  |  |  |
Future period of stock option expense recognition (in years) |  |  |  |  | 1 year 3 months 18 days |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 177,867 | 139,111 | 178,461 |  |  |  |  |
Conversion ratio (in shares) |  |  |  |  | 1 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Directors Plan 2017 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issued during period from award (in shares) |  |  |  |  | 9,905 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Plan 2021 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 151,693 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Management Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock remaining authorized (in shares) |  |  |  |  | 230,149 |  |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Future period of stock option expense recognition (in years) |  |  |  |  | 1 year 3 months 18 days |  |  |  |  |  |  |
Deferred rate for annual cash bonus payment |  |  |  |  | 100.00% |  |  |  |  |  |  |
Quarterly basis discount rate of common stock on closing price |  |  |  |  | 25.00% |  |  |  |  |  |  |
Minimum deferral period |  |  |  |  | 3 years |  |  |  |  |  |  |
Fair value of shares vested |  |  |  |  | $ 5.8 | $ 4,900,000 | $ 2,800,000 |  |  |  |  |
Granted (in shares) |  |  |  |  | 193,016 |  |  |  |  |  |  |
Shares issued during period from award (in shares) |  |  |  |  | 5,665 |  |  |  |  |  |  |
Conversion ratio (in shares) |  |  |  |  | 1 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | 2017 Outside Director's Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock allocation of awards as a percent |  | 100.00% |  |  |  |  |  |  |  |  |  |
Stock Units And Restricted Stock Units | Plan 2021 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issued during period from award (in shares) |  |  |  |  | 111,774 |  |  |  |  |  |  |
Stock Units And Restricted Stock Units | Plan 2011 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issued during period from award (in shares) |  |  |  |  | 48,453 |  |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock remaining authorized (in shares) |  |  |  |  | 69,465 |  |  |  |  |  |  |
Quarterly basis discount rate of common stock on closing price |  |  |  |  | 15.00% |  |  |  |  |  |  |

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