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Severance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 26, 2020
Jun. 26, 2020
Jun. 28, 2019
Sep. 27, 2019
Restructuring Cost and Reserve [Line Items]        
Severance costs     $ 19.8  
COVID-Related Serverance | Cost of Services Provided and Selling and General Corporate Expenses        
Restructuring Cost and Reserve [Line Items]        
Severance costs $ 124.9 $ 124.9    
COVID-Related Serverance | Cost of Services Provided and Selling and General Corporate Expenses | Corporate, Non-Segment        
Restructuring Cost and Reserve [Line Items]        
Severance costs 1.7 1.7    
COVID-Related Serverance | Cost of Services Provided and Selling and General Corporate Expenses | FSS United States        
Restructuring Cost and Reserve [Line Items]        
Severance costs 48.2 48.2    
COVID-Related Serverance | Cost of Services Provided and Selling and General Corporate Expenses | FSS International        
Restructuring Cost and Reserve [Line Items]        
Severance costs 74.7 74.7    
COVID-Related Serverance | Cost of Services Provided and Selling and General Corporate Expenses | Uniform        
Restructuring Cost and Reserve [Line Items]        
Severance costs 0.3 0.3    
Employee severance and other costs        
Restructuring Cost and Reserve [Line Items]        
Severance and related costs accrual $ 4.3 $ 4.3   $ 11.9