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Severance (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 28, 2019
Jun. 29, 2018
Sep. 28, 2018
Efficiencies and effectiveness of it's selling, general and administrative functions      
Restructuring Cost and Reserve [Line Items]      
Severance costs $ 19.8 $ 39.5  
Employee severance and other costs      
Restructuring Cost and Reserve [Line Items]      
Severance and related costs accrual $ 17.3   $ 16.6