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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
9 Months Ended
Jul. 03, 2020
Sep. 28, 2019
Sep. 27, 2019
New Accounting Pronouncement, Early Adoption [Line Items]      
Fiscal Period, Policy [Policy Text Block] We have a 52- or 53-week fiscal year ending on the Friday closest to the last day of September. Fiscal year 2020 includes 53 weeks and fiscal year 2019 includes 52 weeks. To offset the effect of holidays, for fiscal years in which there are 53 weeks, we include the extra week arising in such fiscal years in the first quarter. Our first fiscal quarter ended January 3, 2020 included 14 weeks.    
Cumulative effect of ASU 2016-02 $ (1,875)    
Operating lease ROU assets 32,157    
Present value of lease liabilities 37,936    
Finance lease assets 33,919    
Present value of lease liabilities 30,857    
Total lease assets $ 66,076   $ 40,442
Accounting Standards Update 2016-02      
New Accounting Pronouncement, Early Adoption [Line Items]      
Present value of lease liabilities   $ 39,000  
Cumulative effect of ASU 2016-02   1,900  
Operating lease ROU assets   37,700  
Present value of lease liabilities   43,600  
Existing obligations recorded as reduction to gross operating right-of-use assets   5,900  
Finance lease assets   35,700  
Present value of lease liabilities   31,800  
Total lease assets   $ 37,100