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Capital Stock and Stock-Based Awards (Details) - Narrative - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended | 49 Months Ended |  |
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Jul. 22, 2020 | Sep. 18, 2019 | Sep. 26, 2018 | Sep. 24, 2014 | May 31, 2021 | May 31, 2020 | May 31, 2019 | Sep. 30, 2011 | 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) |  |  |  |  | 4,987,262 | 3,002,981 |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 21.07 |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 4,800 |  |  |  |  |
Future period of stock option expense recognition (in years) |  |  |  |  | 2 years 9 months 18 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 2,385,096 |  |  |  |  |
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 | $ 90 |  |  |  |  |  |  |  |  |
Directors Plan 2017 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 20.48 |  |  |  |  |  |  |  |
Restricted stock outstanding (in shares) |  | 18,452 |  |  |  |  |  |  |  |
Shares reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 400,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 59,038 |  |  |  |  |  |  |  |
Plan 2011 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Increase in shares available for grant (in shares) |  |  | 2,540,000 | 2,475,000 |  |  |  |  |  |
Total number of shares available for grant (in shares) |  |  | 7,115,000 |  |  |  |  |  |  |
Options outstanding ( in shares) |  |  |  |  | 4,788,742 |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 21.08 |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan (in shares) |  |  |  |  | 661,092 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 2,326,058 |  |  |  |  |
2007 Directors’ Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options outstanding ( in shares) |  |  |  |  | 77,394 |  |  |  |  |
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) |  |  |  |  | 121,126 |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 1,800 |  |  |  |  |
Future period of stock option expense recognition (in years) |  |  |  |  | 1 year 7 months 6 days |  |  |  |  |
Common stock issued from conversion of RSUs (in shares) |  |  |  |  | 38,555 |  |  |  |  |
Management Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan (in shares) |  |  |  |  | 305,952 |  |  |  |  |
Stock option compensation cost not yet recognized |  |  |  |  | $ 100 |  |  |  |  |
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 |  |  |  |  |  | $ 2,800 | $ 2,700 |  |  |
Stock Units And Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of shares vested |  |  |  |  | $ 3,200 |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan (in shares) |  |  |  |  | 289,142 |  |  |  |  |
Quarterly basis discount rate of common stock on closing price |  |  |  |  | 15.00% |  |  |  |  |

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