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Employee Benefit Plans - Total Contributions Made to Multiemployer Pension Plans (Details) - Pension Benefits [Member] - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Multiemployer Plans [Line Items]      
Contributions $ 467 $ 748 $ 1,073
Local 282 Pension Trust [Member]      
Multiemployer Plans [Line Items]      
Pension Fund [1] Local 282 Pension Trust    
EIN/Pension Plan Number [1] 116245313    
PPA Zone Status [1] Green Green  
FIP/RP Status [1] NA    
Contributions [1] $ 252 $ 281 269
Contributions greater than 5% of Total Plan Contributions [1] false    
Expiration date of CBA [1] Aug. 31, 2019    
Teamsters Industrial Employees Pension Fund [Member]      
Multiemployer Plans [Line Items]      
Pension Fund [2] Teamsters Industrial Employees Pension Fund    
EIN/Pension Plan Number [2] 226099363    
PPA Zone Status [2] Green Green  
FIP/RP Status [2] NA    
Contributions [2] $ 190 $ 207 200
Contributions greater than 5% of Total Plan Contributions [2] false    
Expiration date of CBA [2] Mar. 31, 2021    
Other [Member]      
Multiemployer Plans [Line Items]      
Pension Fund [3] Other    
Contributions [3] $ 25 $ 260 $ 604
Contributions greater than 5% of Total Plan Contributions [3] false    
[1] Based on most recent available valuation information for plan year ended February 2016.
[2] Based on most recent available valuation information for plan year ended December 2015.
[3] Includes the MEPPs from which the Partnership withdrew.