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Stock-Based Compensation | 9 Months Ended
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Feb. 29, 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 |  | Nine months ended
| February 29, |  | February 28, |  | February 29, |  | February 28,
| 2016 |  | 2015 |  | 2016 |  | 2015
Stock option expense | $ | 0.8 |  |  | $ | 0.8 |  |  | $ | 5.2 |  |  | $ | 5.4 |
Restricted stock unit expense | 0.7 |  |  | 0.6 |  |  | 2.1 |  |  | 1.9 |
Management stock purchase plan | 0.0 |  |  | 0.1 |  |  | 0.6 |  |  | 0.7 |
Employee stock purchase plan | 0.1 |  |  | 0.1 |  |  | 0.2 |  |  | 0.2 |
Total stock-based compensation expense | $ | 1.6 |  |  | $ | 1.6 |  |  | $ | 8.1 |  |  | $ | 8.2 |
During the three month periods ended February 29, 2016 and February 28, 2015, respectively, less than 0.1 million and 0.1 million shares of Common Stock were issued by the Corporation pursuant to its stock-based compensation plans. For the nine month periods ended February 29, 2016 and February 28, 2015, respectively, approximately 1.2 million and 0.6 million shares of Common Stock were issued by the Corporation pursuant to its stock-based compensation plans. For the three and nine month periods ended February 28, 2015, total stock-based compensation expense included $0.2 and $0.8, 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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