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Stock-Based Compensation (Tables) | 3 Months Ended
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Aug. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | The following table summarizes stock-based compensation expense included in Selling, general and administrative expenses for the periods indicated:
| Three months ended |
| August 31, | August 31, |  |
| 2021 | 2020 |  |
Stock option expense | $ | 0.7 |  |  | $ | 0.3 |  |  |  |  |  |  |  |
Restricted stock unit expense |  | 0.7 |  |  |  | 0.2 |  |  |  |  |  |  |  |
Management stock purchase plan |  | 0.0 |  |  |  | — |  |  |  |  |  |  |  |
Employee stock purchase plan |  | 0.1 |  |  |  | 0.1 |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ | 1.5 |  |  | $ | 0.6 |  |  |  |  |  |  |  |
Schedule of Shares Issued Pursuant to Share-based Compensation Activity | The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:
| Three months ended |  |
| August 31, |  | August 31, |  |  |  |
| 2021 |  | 2020 |  |  |  |
Common Stock issued pursuant to stock-based compensation plans (in millions) | 0.1 |  |  | 0.0 |  |  |  |  |

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