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Stock-Based Compensation (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 1.6 | $ 1.6 | $ 6.8 | $ 9.1
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 0.1 | 0.2 | 0.4 | 0.4
Stock option expense |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 0.7 | $ 0.8 | $ 4.3 | $ 6.2
Restricted stock unit expense |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | 0.7 | 0.6 | 2.0 | 2.0
Management stock purchase plan |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | 0.0 | 0.1 | 0.2 | 0.7
Employee stock purchase plan |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 0.2 | $ 0.1 | $ 0.3 | $ 0.2

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