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Employee Benefit Plans - Narrative (Details)
$ in Millions
3 Months Ended
Aug. 31, 2017
USD ($)
United States  
Employee Benefit Plans (Details) [Line Items]  
Minimum threshold to trigger settlement charge $ 3.0
Lump sum benefit payments made 0.6
Pension Plans | United States  
Employee Benefit Plans (Details) [Line Items]  
Pension contributions 0.0
Pension Plans | United Kingdom  
Employee Benefit Plans (Details) [Line Items]  
Pension contributions 0.3
Contributions expected in current fiscal year $ 1.1