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Goodwill and Other Intangible Assets - Carrying Values of Goodwill Assigned to Partnership's Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 28, 2024
Sep. 28, 2024
Goodwill [Line Items]    
Goodwill $ 1,167,349 $ 1,157,714
Accumulated adjustments (6,462) (6,462)
Goodwill, net 1,160,887 1,151,252
Goodwill acquired [1] 9,635  
Propane [Member]    
Goodwill [Line Items]    
Goodwill 1,117,290 1,107,655
Accumulated adjustments 0 0
Goodwill, net 1,117,290 1,107,655
Goodwill acquired [1] 9,635  
Fuel Oil and Refined Fuels [Member]    
Goodwill [Line Items]    
Goodwill 10,900 10,900
Accumulated adjustments (6,462) (6,462)
Goodwill, net 4,438 4,438
Goodwill acquired [1] 0  
Natural Gas and Electricity [Member]    
Goodwill [Line Items]    
Goodwill 7,900 7,900
Accumulated adjustments 0 0
Goodwill, net 7,900 7,900
Goodwill acquired [1] 0  
All Other [Member]    
Goodwill [Line Items]    
Goodwill 31,259 31,259
Accumulated adjustments 0 0
Goodwill, net 31,259 $ 31,259
Goodwill acquired [1] $ 0  
[1]

(1) Reflects the impact from acquisitions (See Note 4).