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Employee Benefit Plans - Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Effect on total fiscal 2014 service and interest cost components, 1 percent increase $ 0
Effect on total fiscal 2014 service and interest cost components, 1 percent decrease 0
Effect on post-retirement benefit obligation at May 31, 2014, 1 percent increase 0.2
Effect on post-retirement benefit obligation at May 31, 2014, 1 percent decrease $ 0.2