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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Sep. 27, 2019
USD ($)
Lawsuit
Dec. 27, 2019
USD ($)
Nov. 30, 2019
USD ($)
Loss Contingencies [Line Items]      
Number of class action lawsuits | Lawsuit 2    
Accrued Expenses and Other Current Liabilities      
Loss Contingencies [Line Items]      
Estimate of possible loss     $ 21.0
Chairman, President and Chief Executive Officer | Employee severance and other costs | Accrued Payroll and Related Expenses      
Loss Contingencies [Line Items]      
Severance costs $ 10.4    
Severance accrual noncurrent   $ 8.8