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Employee Benefit Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 20, 2016
Aug. 31, 2016
United States Pension Plan    
Employee Benefit Plans (Details) [Line Items]    
Pension contributions   $ 0.0
Minimum threshold to trigger settlement charge   3.2
Lump sum benefit payments made   0.7
United Kingdom Pension Plan    
Employee Benefit Plans (Details) [Line Items]    
Pension contributions   0.3
Pension Plans    
Employee Benefit Plans (Details) [Line Items]    
Contributions expected in current fiscal year   $ 1.3
Minimum    
Employee Benefit Plans (Details) [Line Items]    
Pension plan termination period 18 months  
Maximum    
Employee Benefit Plans (Details) [Line Items]    
Pension plan termination period 24 months