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Restructuring (Details)
$ in Millions
 12 Months Ended
Dec. 05, 2013
USD ($)
Employees
May 31, 2016
USD ($)
May 31, 2015
USD ($)
Operational Excellence Program      
Restructuring Cost and Reserve [Line Items]      
Period of restructuring plan 3 years    
Expected restructuring costs $ 4.9    
Restructuring costs incurred to date   $ 1.5 $ 2.0
Accelerated depreciation due to restructuring   1.0 1.5
Profitability Improvement Plan      
Restructuring Cost and Reserve [Line Items]      
Accelerated depreciation due to restructuring   1.9 0.8
Gain related to the modification of stock based compensation   0.7  
Severance | Operational Excellence Program      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs incurred to date   $ 0.5 $ 0.5
Minimum      
Restructuring Cost and Reserve [Line Items]      
Expected number of positions (employee) | Employees 80,000    
Minimum | Operational Excellence Program      
Restructuring Cost and Reserve [Line Items]      
Expected future saving $ 15.0    
Maximum      
Restructuring Cost and Reserve [Line Items]      
Expected number of positions (employee) | Employees 100,000    
Maximum | Operational Excellence Program      
Restructuring Cost and Reserve [Line Items]      
Expected future saving $ 18.0    
Facility Improvements | Operational Excellence Program      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs $ 5.4