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Capital Stock and Stock-Based Awards (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended | 49 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 18, 2019 | Sep. 26, 2018 | Sep. 24, 2014 | Jul. 31, 2019 | May 31, 2020 | May 31, 2019 | May 31, 2018 | Sep. 30, 2011 | Sep. 30, 2017 | Sep. 30, 2007
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock issued |  |  |  |  | 0 | 0 |  |  |  |
Options outstanding (Shares) |  |  |  |  | 3,002,981 | 2,942,129 |  |  |  |
Options exercised (Shares) |  |  |  |  | 26,326 |  |  |  |  |
Options granted (Shares) |  |  |  |  | 125,563 |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) |  |  |  |  | $ 32.12 |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 1,500 |  |  |  |  |
Future period of stock option expense recognition |  |  |  |  | 2 years 1 month 6 days |  |  |  |  |
Stock-based compensation cost |  |  |  |  | $ 3,800 | $ 8,300 | $ 10,700 |  |  |
2017 Outside Director's Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  |  |  |  |  |  |  | 400,000 |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  |  |  | $ 90,000 |  |  |  |  |  |
Amended 2007 Directors Plan [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted (Shares) | 24,297 |  |  |  |  |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) | $ 39.33 |  |  |  |  |  |  |  |  |
Restricted stock outstanding | 9,604 |  |  |  |  |  |  |  |  |
Directors Plan 2017 [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Options outstanding (Shares) |  |  |  |  | 62,088 |  |  |  |  |
Restricted Stock [Member] | 2017 Outside Director's Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Stock Allocation Percentage |  |  |  | 60.00% |  |  |  |  |  |
2001 Plan [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Options outstanding (Shares) |  |  |  |  | 99,212 |  |  |  |  |
Plan 2011 [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  | 2,540,000 | 2,475,000 |  |  |  |  |  |  |
Increase in number of shares available for grant |  | 7,115,000 |  |  |  |  |  |  |  |
Options outstanding (Shares) |  |  |  |  | 2,749,287 |  |  |  |  |
Options granted (Shares) |  |  |  |  | 101,266 |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) |  |  |  |  | $ 30.38 |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan |  |  |  |  | 2,803,519 |  |  |  |  |
Granted (Shares) |  |  |  |  | 11,316 |  |  |  |  |
2007 Directors’ Plan [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Options outstanding (Shares) |  |  |  |  | 92,394 |  |  |  |  |
Non-qualified stock options outstanding |  |  |  |  |  |  |  |  |  | 3,000
Restricted stock outstanding |  |  |  |  |  |  |  | 1,200 |  |
Share-based Payment Arrangement, Option [Member] | 2017 Outside Director's Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Stock Allocation Percentage |  |  |  | 40.00% |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 1,500 |  |  |  |  |
Future period of stock option expense recognition |  |  |  |  | 2 years 4 months 24 days |  |  |  |  |
Common stock issued from conversion of RSUs |  |  |  |  | 43,248 |  |  |  |  |
Granted (Shares) |  |  |  |  | 34,632 | 82,044 | 68,089 |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan |  |  |  |  | 356,239 |  |  |  |  |
Quarterly basis discount rate of common stock on closing price |  |  |  |  | 15.00% |  |  |  |  |
Management Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan |  |  |  |  | 283,017 |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 0 |  |  |  |  |
Granted (Shares) |  |  |  |  | 3,843 | 17,239 | 73,965 |  |  |
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 |  |  |  |  |  | $ 2,700 | $ 3,600 |  |  |
Stock Units And Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (Shares) |  |  |  |  | 38,475 |  |  |  |  |
Fair value of shares vested |  |  |  |  | $ 2,800 |  |  |  |  |

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