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Capital Stock and Stock-Based Awards - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended | 49 Months Ended |  |  |
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Jul. 21, 2021 | Sep. 26, 2018 | Sep. 24, 2014 | May 31, 2023 | May 31, 2022 | May 31, 2021 | Sep. 30, 2011 | Sep. 21, 2021 | Sep. 30, 2017 | 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) |  |  |  | 3,188,401 | 4,257,925 |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 41.90 |  |  |  |  |  |
Granted (Shares) |  |  |  | 314,996 |  |  |  |  |  |
Minimum period before grants exercisable |  |  |  | 1 year |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  | $ 3,400 |  |  |  |  |  |
Future period of stock option expense recognition (in years) |  |  |  | 1 year 8 months 12 days |  |  |  |  |  |
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 |  |  |  |  |  |
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 | $ 100 |  |  |  |  |  |  |  |  |
Directors Plan 2017 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 42.40 |  |  |  |  |  |
Shares reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 400,000 |
Restricted stock outstanding (in shares) |  |  |  | 9,905 |  |  |  |  |  |
Granted (Shares) |  |  |  | 20,510 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Increase in shares available for grant (in shares) |  | 2,540,000 | 2,475,000 |  |  |  |  |  |  |
Options outstanding ( in shares) |  |  |  | 2,365,853 |  |  |  |  |  |
Common stock issued from conversion of RSUs (in shares) |  |  |  | 99,237 |  |  |  |  |  |
2007 Directors’ Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options outstanding ( in shares) |  |  |  | 44,817 |  |  |  |  |  |
Non-qualified stock options outstanding (in shares) |  |  |  |  |  |  |  |  |  | 3,000
Restricted stock outstanding (in shares) |  |  |  |  |  |  | 1,200 |  |  |
Restricted Stock | 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 | 60.00% |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option | 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 | 40.00% |  |  |  |  |  |  |  |  |
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) |  |  |  | 147,736 |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  | $ 4,600 |  |  |  |  |  |
Future period of stock option expense recognition (in years) |  |  |  | 1 year 6 months |  |  |  |  |  |
Restricted Stock Units (RSUs) | Management Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum deferral period |  |  |  | 3 years |  |  |  |  |  |
Management Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock remaining authorized (in shares) |  |  |  | 242,672 |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  | $ 200 |  |  |  |  |  |
Future period of stock option expense recognition (in years) |  |  |  | 2 years 2 months 12 days |  |  |  |  |  |
Deferred rate for annual cash bonus payment |  |  |  | 100.00% |  |  |  |  |  |
Quarterly basis discount rate of common stock on closing price |  |  |  | 25.00% |  |  |  |  |  |
Fair value of shares vested |  |  |  | $ 4,900 | $ 2,800 | $ 3,200 |  |  |  |
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) |  |  |  | 617,607 |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 41.86 |  |  |  |  |  |
Common stock remaining authorized (in shares) |  |  |  | 1,621,732 |  |  |  |  |  |
Granted (Shares) |  |  |  | 294,486 |  |  |  |  |  |
Common stock issued from conversion of RSUs (in shares) |  |  |  | 41,177 |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock remaining authorized (in shares) |  |  |  | 148,923 |  |  |  |  |  |
Quarterly basis discount rate of common stock on closing price |  |  |  | 15.00% |  |  |  |  |  |

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