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Stock-Based Compensation (Tables) | 6 Months Ended
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Nov. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | 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 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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