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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 20, 2016
Feb. 28, 2017
United States    
Employee Benefit Plans (Details) [Line Items]    
Minimum threshold to trigger settlement charge   $ 3.2
Lump sum benefit payments made   2.3
Pension Plans    
Employee Benefit Plans (Details) [Line Items]    
Contributions expected in current fiscal year   1.1
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   $ 0.8
Minimum    
Employee Benefit Plans (Details) [Line Items]    
Pension plan termination period 12 months  
Maximum    
Employee Benefit Plans (Details) [Line Items]    
Pension plan termination period 18 months