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Severance (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 29, 2019
Mar. 30, 2018
Sep. 28, 2018
Efficiencies and effectiveness of it's selling, general and administrative functions      
Restructuring Cost and Reserve [Line Items]      
Severance Costs $ 22.0 $ 39.5  
Employee severance and other costs      
Restructuring Cost and Reserve [Line Items]      
Severance and related costs accrual $ 23.5   $ 16.6