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Long-Term Borrowings - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 24, 2022
Mar. 15, 2024
Dec. 28, 2022
Debt Instrument [Line Items]          
Ownership interest in Suburban Energy Finance Corp (in hundredths) 100.00%        
Stated interest rate (in hundredths)         5.50%
Long-term borrowings $ 1,219,167 $ 1,198,766     $ 80,645
Loss on debt extinguishment $ 215 0 $ 0    
Consolidated fixed charge coverage ratio, minimum 1.75        
Capitalized costs $ 3,744        
Long-term debt maturities, 2025   0      
Long-term debt maturities, 2026 0        
Long-term debt maturities, 2027 501,000        
Long-term debt maturities, 2028 0        
Long-term debt maturities, 2029 11,707        
Long-term debt maturities, thereafter $ 718,938        
Federal Funds Rate [Member]          
Debt Instrument [Line Items]          
Description of applicable interest rate on borrowings Federal Funds Rate        
Margin over basis rate (in hundredths) 0.50%        
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]          
Debt Instrument [Line Items]          
Description of applicable interest rate on borrowings SOFR        
Margin over basis rate (in hundredths) 1.00%        
Fourth Amended And Restated Credit Agreement [Member]          
Debt Instrument [Line Items]          
Deferred debt issuance cost, writeoff $ 215        
Amended Revolving Credit Facility Due2025 [Member]          
Debt Instrument [Line Items]          
Margin over basis rate (in hundredths) 1.00%        
Weighted average interest rate (in hundredths) 7.80%        
Amended Revolving Credit Facility Due2025 [Member] | Federal Funds Rate [Member]          
Debt Instrument [Line Items]          
Description of applicable interest rate on borrowings Federal Funds Rate        
Margin over basis rate (in hundredths) 0.50%        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Long-term borrowings $ 151,000 132,000      
Maturity date Mar. 15, 2029        
Deferred debt issuance cost, writeoff $ 215        
Consolidated interest coverage ratio, minimum 2.5        
Total consolidated leverage ratio 5.75        
Senior secured unconsolidated leverage ratio maximum 3.25        
Standby letters of credit issued under the Revolving Credit Facility $ 30,887        
Standby letters of credit issued under the Revolving Credit Facility, expiration date Apr. 30, 2025        
Revolving Credit Facility [Member] | Third Amended and Restated Credit [Member]          
Debt Instrument [Line Items]          
Long-term borrowings $ 187,900        
Revolving Credit Facility [Member] | Fourth Amended And Restated Credit Agreement [Member]          
Debt Instrument [Line Items]          
Long-term borrowings $ 151,000 132,000      
Maturity date Mar. 15, 2029        
Credit Facility, maximum amount       $ 500,000  
Capitalized debt origination costs $ 3,237 $ 903      
5.875% Senior Notes due March 1, 2027 [Member]          
Debt Instrument [Line Items]          
Stated interest rate (in hundredths) 5.875% 5.875%      
Maturity date Mar. 01, 2027 Mar. 01, 2027      
5.0% Senior Notes due June 1, 2031 [Member]          
Debt Instrument [Line Items]          
Ownership interest in Suburban Energy Finance Corp (in hundredths) 100.00%        
Stated interest rate (in hundredths) 5.00% 5.00%      
Date public offering completed May 24, 2021        
Percentage of principal amount at which debt was issued (in hundredths) 100.00%        
Maturity date Jun. 01, 2031 Jun. 01, 2031      
Aggregate principal amount $ 650,000        
Senior Notes Due2024 [Member]          
Debt Instrument [Line Items]          
Stated interest rate (in hundredths) 5.50%        
Senior Notes Due2025 [Member]          
Debt Instrument [Line Items]          
Stated interest rate (in hundredths) 5.75%        
Senior Notes [Member] | 5.875% Senior Notes due March 1, 2027 [Member]          
Debt Instrument [Line Items]          
Ownership interest in Suburban Energy Finance Corp (in hundredths) 100.00%        
Stated interest rate (in hundredths) 5.875%        
Date public offering completed Feb. 14, 2017        
Long-term borrowings $ 350,000 $ 350,000      
Percentage of principal amount at which debt was issued (in hundredths) 100.00%        
Maturity date Mar. 01, 2027        
Aggregate principal amount $ 350,000        
Redemption start date Mar. 01, 2022        
Redemption description The 2027 Senior Notes are redeemable, at the Partnership’s option, in whole or in part, at any time on or after March 1, 2022, in each case at the redemption prices described in the table below, together with any accrued and unpaid interest to the date of the redemption.        
Percentage of the principal amount repurchase offer under change of control provision (in hundredths) 101.00%        
Repurchase of debt due to decline in rating after consummation of change of control, period 90 days        
Senior Notes [Member] | 7.375% Senior Notes due August 1, 2021 [Member]          
Debt Instrument [Line Items]          
Stated interest rate (in hundredths) 7.375%        
Senior Notes [Member] | 5.0% Senior Notes due June 1, 2031 [Member]          
Debt Instrument [Line Items]          
Long-term borrowings $ 650,000 $ 650,000      
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)   101.00%      
Repurchase of debt due to decline in rating after consummation of change of control, period   90 days