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Restructuring Expense Restructuring Activities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Aug. 31, 2019
Sep. 01, 2018
Jun. 01, 2019
Restructuring Cost and Reserve [Line Items]      
Restructuring Costs $ 1.8 $ 1.1  
Restructuring Reserve [Roll Forward]      
Restructuring Costs 1.8 $ 1.1  
North America Contract      
Restructuring Cost and Reserve [Line Items]      
Effect on Future Earnings, Amount 10.0    
Restructuring Costs 1.6    
Restructuring and Related Cost, Cost Incurred to Date 9.3    
Restructuring and Related Cost, Expected Cost Remaining 0.1    
Restructuring Reserve [Roll Forward]      
Beginning Balance 7.7    
Restructuring Costs 1.6    
Amounts Paid (4.9)    
Ending Balance 4.4   $ 7.7
North America Contract | Severance and Employee-Related      
Restructuring Cost and Reserve [Line Items]      
Restructuring Costs 1.6    
Restructuring Reserve [Roll Forward]      
Beginning Balance 6.7    
Restructuring Costs 1.6    
Amounts Paid (4.8)    
Ending Balance 3.5   6.7
North America Contract | Exit or Disposal Activities      
Restructuring Cost and Reserve [Line Items]      
Restructuring Costs 0.0    
Restructuring Reserve [Roll Forward]      
Beginning Balance 1.0    
Restructuring Costs 0.0    
Amounts Paid (0.1)    
Ending Balance 0.9   1.0
International Contract      
Restructuring Cost and Reserve [Line Items]      
Effect on Future Earnings, Amount 3.0    
Restructuring Costs 0.2   2.5
Restructuring and Related Cost, Cost Incurred to Date 6.6    
Restructuring and Related Cost, Expected Cost Remaining 1.7    
Restructuring Reserve [Roll Forward]      
Beginning Balance 0.2    
Restructuring Costs 0.2   2.5
Amounts Paid (0.4)    
Ending Balance 0.0   0.2
Assets Held-for-sale, Long Lived, Fair Value Disclosure 4.1    
International Contract | UNITED KINGDOM      
Restructuring Reserve [Roll Forward]      
Charges Against Assets     (0.8)
International Contract | CHINA      
Restructuring Cost and Reserve [Line Items]      
Restructuring Costs     1.4
Restructuring Reserve [Roll Forward]      
Restructuring Costs     1.4
International Contract | Severance and Employee-Related      
Restructuring Cost and Reserve [Line Items]      
Restructuring Costs 0.0    
Restructuring Reserve [Roll Forward]      
Beginning Balance 0.1    
Restructuring Costs 0.0    
Amounts Paid (0.1)    
Ending Balance 0.0   0.1
International Contract | Exit or Disposal Activities      
Restructuring Cost and Reserve [Line Items]      
Restructuring Costs 0.2    
Restructuring Reserve [Roll Forward]      
Beginning Balance 0.1    
Restructuring Costs 0.2    
Amounts Paid (0.3)    
Ending Balance $ 0.0   $ 0.1