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Stock-Based Compensation | 9 Months Ended
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Feb. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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 February 28, | Nine months ended February 28,
| 2018 |  | 2017 | 2018 |  | 2017
Stock option expense | $ | 0.8 |  |  | $ | 0.9 |  | $ | 6.2 |  |  | $ | 6.0 |
Restricted stock unit expense | 0.6 |  |  | 0.6 |  | 2.0 |  |  | 2.0 |
Management stock purchase plan | 0.1 |  |  | 0.1 |  | 0.7 |  |  | 0.5 |
Employee stock purchase plan | 0.1 |  |  | 0.0 |  | 0.2 |  |  | 0.2 |
Total stock-based compensation expense | $ | 1.6 |  |  | $ | 1.6 |  | $ | 9.1 |  |  | $ | 8.7 |
The following table sets forth Common Stock issued pursuant to stock-based compensation plans as of the dates indicated:
| Three months ended February 28, | Nine months ended February 28,
| 2018 |  | 2017 | 2018 |  | 2017
Common Stock issued pursuant to stock-based compensation plans (in millions) | 0.2 |  |  | 0.4 |  | 0.4 |  |  | 0.7 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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