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Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 04, 2020
Dec. 29, 2018
Sep. 28, 2019
Debt Instrument [Line Items]      
Interest expense $ 1,900 $ 2,900  
Senior Term Loan | Senior Credit Facility      
Debt Instrument [Line Items]      
Long-term line of credit $ 183,800   $ 186,300
Stated interest rate (as a percent) 4.00%   4.40%
Weighted average effective interest rate (as a percent) 4.50%   5.00%
Revolving Credit Facility | Credit Facility | Senior Revolving Credit Facility      
Debt Instrument [Line Items]      
Long-term line of credit $ 35,000    
Letters of Credit | Credit Facility | Senior Revolving Credit Facility      
Debt Instrument [Line Items]      
Letters of credit, amount outstanding 6,900    
Remaining borrowing capacity $ 58,100