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Stock-Based Compensation | 6 Months Ended
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Nov. 30, 2019
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 November 30, |  | Six months ended November 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock option expense | $0.4 |  | $2.8 |  | $1.0 |  | $3.6
Restricted stock unit expense | 0.4 |  | 0.7 |  | 1.2 |  | 1.3
Management stock purchase plan | 0.0 |  | 0.2 |  | 0.0 |  | 0.2
Employee stock purchase plan | 0.1 |  | 0.0 |  | 0.2 |  | 0.1
Total stock-based compensation expense | $0.9 |  | $3.7 |  | $2.4 |  | $5.2
The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:
| Three months ended November 30, |  | Six months ended November 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Common Stock issued pursuant to stock-based compensation plans (in millions) | 0.1 |  | 0.2 |  | 0.1 |  | 0.3

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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