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Stock-Based Compensation (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020 | Sep. 21, 2021
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 3.0 | $ 3.0 | $ 4.5 | $ 3.6 |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 200 | 100 | 300 | 100 |
Stock option expense |  |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 1.8 | $ 2.5 | $ 2.5 | $ 2.8 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  | 2,500
Restricted stock unit expense |  |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |  |
Stock-based compensation expense | 0.9 | 0.5 | 1.6 | 0.7 |
Management stock purchase plan |  |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |  |
Stock-based compensation expense | 0.3 | 0.0 | 0.3 | 0.0 |
Employee stock purchase plan |  |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 0.0 | $ 0.0 | $ 0.1 | $ 0.1 |

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