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Stock-Based Compensation (Tables) | 6 Months Ended
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Nov. 30, 2019
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,
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock option expense | $0.4 |  | $2.8 |  | $1.0 |  | $3.6
Restricted stock unit expense | 0.4 |  | 0.7 |  | 1.2 |  | 1.3
Management stock purchase plan | 0.0 |  | 0.2 |  | 0.0 |  | 0.2
Employee stock purchase plan | 0.1 |  | 0.0 |  | 0.2 |  | 0.1
Total stock-based compensation expense | $0.9 |  | $3.7 |  | $2.4 |  | $5.2
Schedule of Shares Issued Pursuant to Share-based Compensation Activity | The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:
| Three months ended November 30, |  | Six months ended November 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Common Stock issued pursuant to stock-based compensation plans (in millions) | 0.1 |  | 0.2 |  | 0.1 |  | 0.3

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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