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Severance (Details) - Employee severance and other costs - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 26, 2020
Jul. 02, 2021
Jun. 26, 2020
Oct. 02, 2020
COVID-Related Serverance        
Restructuring Cost and Reserve [Line Items]        
Severance and related costs accrual   $ 49.6   $ 118.5
Costs of Services Provided and Selling, General and Corporate Expenses        
Restructuring Cost and Reserve [Line Items]        
Severance costs $ 124.9 $ 5.4 $ 124.9