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Employee Benefit Plans - Narrative (Details) - Pension Plans - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 14, 2018
Aug. 31, 2018
May 31, 2018
United States      
Employee Benefit Plans (Details) [Line Items]      
Lump sum benefit payments made     $ 37.8
Group annuity contracts acquired to settle benefit obligation $ 86.3    
United Kingdom      
Employee Benefit Plans (Details) [Line Items]      
Pension contributions   $ 0.3  
Contributions expected in current fiscal year   $ 1.1