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Stock-Based Compensation (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |
Stock-based compensation expense | $ 1.5 | $ 1.5
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 0.1 | 0.1
Stock option expense |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |
Stock-based compensation expense | $ 0.8 | $ 0.8
Restricted stock unit expense |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |
Stock-based compensation expense | 0.6 | 0.6
Management stock purchase plan |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |
Stock-based compensation expense | 0.0 | 0.0
Employee stock purchase plan |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |
Stock-based compensation expense | $ 0.1 | $ 0.1

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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