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Stock-Based Compensation | 6 Months Ended
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Nov. 30, 2016
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,
| 2016 |  | 2015 |  | 2016 |  | 2015
Stock option expense | $ | 4.3 |  |  | $ | 3.8 |  |  | $ | 5.1 |  |  | $ | 4.4 |
Restricted stock unit expense | 0.7 |  |  | 0.7 |  |  | 1.4 |  |  | 1.4 |
Management stock purchase plan | 0.4 |  |  | 0.6 |  |  | 0.4 |  |  | 0.6 |
Employee stock purchase plan | 0.1 |  |  | 0.0 |  |  | 0.2 |  |  | 0.1 |
Total stock-based compensation expense | $ | 5.5 |  |  | $ | 5.1 |  |  | $ | 7.1 |  |  | $ | 6.5 |
The following table sets forth Common Stock issued pursuant to stock-based compensation plans as of the dates indicated:
| Three months ended November 30, |  | Six months ended November 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Common Stock issued pursuant to stock-based compensation plans (in millions) | 0.1 |  |  | 0.2 |  |  | 0.3 |  |  | 1.2 |

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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 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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