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Employee Benefit Plans (Details)
$ in Millions
9 Months Ended
Feb. 29, 2016
USD ($)
United States Pension Plan  
Employee Benefit Plans (Details) [Line Items]  
Pension contributions $ 0.0
Minimum threshold to trigger settlement charge 4.6
Lump sum benefit payments made 3.1
United Kingdom Pension Plan  
Employee Benefit Plans (Details) [Line Items]  
Pension contributions 0.9
Pension Plans  
Employee Benefit Plans (Details) [Line Items]  
Contributions expected in current fiscal year $ 1.3