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Employee Benefit Plans - Total Contributions Made to Multiemployer Pension Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Multiemployer Plans [Line Items]      
EIN/Pension Plan Number 22-3410353    
Pension Benefits [Member]      
Multiemployer Plans [Line Items]      
Contributions $ 499 $ 442 $ 467
Pension Benefits [Member] | Local 282 Pension Trust [Member]      
Multiemployer Plans [Line Items]      
Pension Fund [1] Local 282 Pension Trust (1)    
EIN/Pension Plan Number [1] 11-6245313    
PPA Zone Status [1] Green Green  
FIP/RP Status [1] NA    
Contributions [1] $ 272 $ 235 252
Contributions greater than 5% of Total Plan Contributions [1] false    
Expiration date of CBA [1] Aug. 31, 2024    
Pension Benefits [Member] | Teamsters Industrial Employees Pension Fund [Member]      
Multiemployer Plans [Line Items]      
Pension Fund [2] Teamsters Industrial Employees    Pension Fund (2)    
EIN/Pension Plan Number [2] 22-6099363    
PPA Zone Status [2] Green Green  
FIP/RP Status [2] NA    
Contributions [2] $ 200 $ 187 190
Contributions greater than 5% of Total Plan Contributions [2] true    
Expiration date of CBA [2] Mar. 31, 2021    
Pension Benefits [Member] | Western Conference of Teamsters Pension Plan [Member]      
Multiemployer Plans [Line Items]      
Pension Fund [2] Western Conference of Teamsters    Pension Plan (2)    
EIN/Pension Plan Number [2] 91-6145047    
PPA Zone Status [2] Green Green  
FIP/RP Status [2] NA    
Contributions [2] $ 27 $ 20 $ 25
Contributions greater than 5% of Total Plan Contributions [2] false    
Expiration date of CBA [2] Feb. 28, 2021    
[1] Based on most recent available valuation information for plan year ended February 2019.
[2] Based on most recent available valuation information for plan year ended December 2018.