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Stock-Based Compensation (Details) - Schedule of stock-based compensation (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]        
Share-based payment awards, options, by number of shares issued from Treasury Stock       0.4
Stock option expense $ 0.8 $ 0.4 $ 5.4 $ 2.0
Restricted stock unit expense 0.2 0.6 2.1 2.4
Stock-based compensation expense 1.1 1.0 7.8 5.2
Management Stock Purchase Plan
       
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]        
Stock-based compensation expense 0 0 0.1 0.6
Employee Stock Purchase Plan
       
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]        
Stock-based compensation expense $ 0.1 $ 0 $ 0.2 $ 0.2