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Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 04, 2020
Mar. 30, 2019
Apr. 04, 2020
Mar. 30, 2019
Sep. 28, 2019
Debt Instrument [Line Items]          
Interest expense $ 5,700 $ 4,000 $ 7,600 $ 6,900  
Senior Term Loan | Senior Credit Facility          
Debt Instrument [Line Items]          
Long-term line of credit $ 181,300   $ 181,300   $ 186,300
Stated interest rate (as a percent) 3.20%   3.20%   4.40%
Weighted average effective interest rate (as a percent) 4.50%   4.50%   5.00%
Revolving Credit Facility | Line of Credit | Senior Revolving Credit Facility          
Debt Instrument [Line Items]          
Long-term line of credit $ 30,000   $ 30,000    
Letters of Credit | Line of Credit | Senior Revolving Credit Facility          
Debt Instrument [Line Items]          
Letters of credit, amount outstanding 6,900   6,900    
Remaining borrowing capacity $ 63,100   $ 63,100