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Stock-Based Compensation (Tables) | 6 Months Ended
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Nov. 30, 2013
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 [Table Text Block] | 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, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Stock option expense |  | $ | 4.4 |  |  | $ | 0.6 |  |  | $ | 4.6 |  |  | $ | 1.6 |
Restricted stock unit expense |  |  | 1.2 |  |  |  | 0.8 |  |  |  | 1.9 |  |  |  | 1.8 |
Management stock purchase plan |  |  | 0.0 |  |  |  | 0.6 |  |  |  | 0.1 |  |  |  | 0.6 |
Employee stock purchase plan |  |  | 0.0 |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.2 |
Total stock-based compensation expense |  | $ | 5.6 |  |  | $ | 2.1 |  |  | $ | 6.7 |  |  | $ | 4.2 |

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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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