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Stock-Based Compensation | 9 Months Ended
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Feb. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments | 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,
| 2014 |  | 2013 |  | 2014 |  | 2013
Stock option expense | $ | 0.8 |  |  | $ | 0.4 |  |  | $ | 5.4 |  |  | $ | 2.0 |
Restricted stock unit expense | 0.2 |  |  | 0.6 |  |  | 2.1 |  |  | 2.4 |
Management stock purchase plan | — |  |  | — |  |  | 0.1 |  |  | 0.6 |
Employee stock purchase plan | 0.1 |  |  | — |  |  | 0.2 |  |  | 0.2 |
Total stock-based compensation expense | $ | 1.1 |  |  | $ | 1.0 |  |  | $ | 7.8 |  |  | $ | 5.2 |
During each of the nine month periods ended February 28, 2014 and 2013, approximately 0.4 million shares of Common Stock were issued by the Corporation pursuant to its stock-based compensation plans.

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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 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: 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=6406099&loc=d3e25284-112666 Reference 4: 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 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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