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Stock-Based Compensation | 9 Months Ended
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Feb. 29, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION The following table summarizes stock-based compensation expense included in Selling, general and administrative expenses for the periods indicated:
| Three months ended | Nine months ended
| February 29, | February 28, | February 29, | February 28,
| 2024 | 2023 | 2024 | 2023
Stock option expense | $ | 0.6 |  |  | $ | 0.7 |  |  | $ | 3.6 |  |  | $ | 3.7 |  |
Restricted stock unit expense |  | 1.6 |  |  |  | 1.4 |  |  |  | 4.5 |  |  |  | 3.7 |  |
Management stock purchase plan |  | 0.0 |  |  |  | 0.1 |  |  |  | 0.3 |  |  |  | 0.5 |  |
Employee stock purchase plan |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.3 |  |  |  | 0.3 |  |
Total stock-based compensation expense | $ | 2.3 |  |  | $ | 2.3 |  |  | $ | 8.7 |  |  | $ | 8.2 |  |
The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:
| Three months ended |  | Nine months ended
| February 29, |  | February 28, |  | February 29, |  | February 28,
| 2024 |  | 2023 |  | 2024 |  | 2023
Common Stock issued pursuant to stock-based compensation plans (in millions) | 0.1 |  |  | 0.1 |  |  | 0.5 |  |  | 0.7 |

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