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Stock-Based Compensation | 6 Months Ended
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Nov. 30, 2015
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,
| 2015 |  | 2014 |  | 2015 |  | 2014
Stock option expense | $ | 3.8 |  |  | $ | 3.8 |  |  | $ | 4.4 |  |  | $ | 4.6 |
Restricted stock unit expense | 0.7 |  |  | 0.6 |  |  | 1.4 |  |  | 1.3 |
Management stock purchase plan | 0.6 |  |  | 0.6 |  |  | 0.6 |  |  | 0.6 |
Employee stock purchase plan | 0.0 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Total stock-based compensation expense | $ | 5.1 |  |  | $ | 5.1 |  |  | $ | 6.5 |  |  | $ | 6.6 |
During the three month periods ended November 30, 2015 and 2014, respectively, approximately 0.2 million and 0.1 million shares of Common Stock were issued by the Corporation pursuant to its stock-based compensation plans. For the six month periods ended November 30, 2015 and 2014, respectively, approximately 1.2 million and 0.5 million shares of Common Stock were issued by the Corporation pursuant to its stock-based compensation plans. For the three and six month periods ended November 30, 2014, total stock-based compensation expense included $0.6 and $0.6, respectively, of expenses recognized in discontinued operations.

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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=6418621&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=51659978&loc=d3e25284-112666 Reference 3: 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 4: 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 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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