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Long-Term Borrowings - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
May 24, 2021
Mar. 05, 2020
Jun. 26, 2021
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Sep. 26, 2020
Feb. 25, 2015
May 27, 2014
Debt Instrument [Line Items]                  
Ownership interest in Suburban Energy Finance Corp (in hundredths)     100.00%   100.00%        
Long-term borrowings     $ 1,151,380,000   $ 1,151,380,000   $ 1,219,600,000    
Loss on debt extinguishment     16,029,000 $ 0 $ 16,029,000 $ 109,000      
Consolidated fixed charge coverage ratio, minimum         1.75        
Long-term debt maturities, 2021     0   $ 0        
Long-term debt maturities, 2022     0   0        
Long-term debt maturities, 2023     0   0        
Long-term debt maturities, 2024     0   0        
Long-term debt maturities, 2025     151,380,000   151,380,000        
Long-term debt maturities, 2025 and thereafter     $ 1,000,000,000   $ 1,000,000,000        
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%        
LIBOR [Member]                  
Debt Instrument [Line Items]                  
Description of applicable interest rate on borrowings         LIBOR        
Margin over basis rate (in hundredths)         1.00%        
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Consolidated interest coverage ratio, minimum         2.5        
Total consolidated leverage ratio         5.75        
Senior secured unconsolidated leverage ratio maximum         3.25        
Amended Credit Agreement Due 2021 [Member]                  
Debt Instrument [Line Items]                  
Weighted average interest rate (in hundredths)     2.15%   2.15%        
Amended Credit Agreement Due 2021 [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%        
Amended Credit Agreement Due 2021 [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Description of applicable interest rate on borrowings         LIBOR        
Margin over basis rate (in hundredths)         1.00%        
Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Loss on debt extinguishment $ (16,029,000)                
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Long-term borrowings     $ 151,380,000   $ 151,380,000   94,600,000    
Maturity date   Mar. 05, 2025     Mar. 05, 2025        
Standby letters of credit issued under the Revolving Credit Facility     56,862,000   $ 56,862,000        
Standby letters of credit issued under the Revolving Credit Facility, expiration date         Apr. 30, 2022        
Revolving Credit Facility [Member] | Third Amended and Restated Credit [Member]                  
Debt Instrument [Line Items]                  
Long-term borrowings     $ 151,380,000   $ 151,380,000   $ 94,600,000    
Credit Facility, maximum amount   $ 500,000,000              
5.5% Senior Notes due June 1, 2024 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     5.50%   5.50%   5.50%    
Maturity date         Jun. 01, 2024        
5.5% Senior Notes due June 1, 2024 [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Redemption premium and related fees 6,217,000                
Write-off unamortized debt origination costs 2,855,000                
5.75% Senior Notes due March 1, 2025 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     5.75%   5.75%   5.75%    
Maturity date         Mar. 01, 2025        
5.75% Senior Notes due March 1, 2025 [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Redemption premium and related fees 5,241,000                
Write-off unamortized debt origination costs $ 1,716,000                
5.875% Senior Notes due March 1, 2027 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     5.875%   5.875%   5.875%    
Maturity date         Mar. 01, 2027        
5.0 % Senior Notes due June 1, 2031 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     5.00% [1]   5.00% [1]   5.00%    
Date public offering completed         May 24, 2021        
Percentage of principal amount at which debt was issued (in hundredths)     100.00%   100.00%        
Maturity date         Jun. 01, 2031        
Aggregate principal amount     $ 650,000,000   $ 650,000,000        
Debt instrument interest redemption percentage         35.00%        
Debt instrument, redemption price, percentage of principal amount redeemed         105.00%        
Senior Notes [Member] | 5.5% Senior Notes due June 1, 2024 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     5.50%   5.50%        
Date public offering completed         May 27, 2014        
Long-term borrowings     $ 0   $ 0   $ 525,000,000   $ 525,000,000
Percentage of principal amount at which debt was issued (in hundredths)     100.00%   100.00%        
Maturity date         Jun. 01, 2024        
Senior Notes [Member] | 7.5% Senior Notes due October 1, 2018 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     7.50%   7.50%        
Senior Notes [Member] | 5.75% Senior Notes due March 1, 2025 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     5.75%   5.75%        
Date public offering completed         Feb. 25, 2015        
Long-term borrowings     $ 0   $ 0   250,000,000 $ 250,000,000  
Percentage of principal amount at which debt was issued (in hundredths)     100.00%   100.00%        
Maturity date         Mar. 01, 2025        
Senior Notes [Member] | 7.375% Senior Notes due 2020 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     7.375%   7.375%        
Senior Notes [Member] | 5.875% Senior Notes due March 1, 2027 [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in hundredths)     5.875%   5.875%        
Date public offering completed         Feb. 14, 2017        
Long-term borrowings     $ 350,000,000   $ 350,000,000   350,000,000    
Percentage of principal amount at which debt was issued (in hundredths)     100.00%   100.00%        
Maturity date         Mar. 01, 2027        
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)     101.00%   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%   7.375%        
Senior Notes [Member] | 5.0 % Senior Notes due June 1, 2031 [Member]                  
Debt Instrument [Line Items]                  
Long-term borrowings     $ 650,000,000   $ 650,000,000   $ 0    
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)     101.00%   101.00%        
Repurchase of debt due to decline in rating after consummation of change of control, period         90 days        
[1] 5.0%