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Stock-Based Compensation (Tables) | 6 Months Ended
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Nov. 30, 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 | Six months ended
| November 30, | November 30,
| 2021 | 2020 | 2021 | 2020
Stock option expense | $ | 1.8 |  |  | $ | 2.5 |  |  | $ | 2.5 |  |  | $ | 2.8 |  |
Restricted stock unit expense |  | 0.9 |  |  |  | 0.5 |  |  |  | 1.6 |  |  |  | 0.7 |  |
Management stock purchase plan |  | 0.3 |  |  |  | 0.0 |  |  |  | 0.3 |  |  |  | 0.0 |  |
Employee stock purchase plan |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.1 |  |  |  | 0.1 |  |
Total stock-based compensation expense | $ | 3.0 |  |  | $ | 3.0 |  |  | $ | 4.5 |  |  | $ | 3.6 |  |
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 |  | Six months ended
| November 30, |  | November 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Common Stock issued pursuant to stock-based compensation plans (in millions) | 0.2 |  |  | 0.1 |  |  | 0.3 |  |  | 0.1 |

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