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Long-Term Borrowings - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 05, 2020 | Dec. 30, 2023 | Sep. 30, 2023 | Dec. 28, 2022
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (in hundredths) |  |  |  | 5.50%
Ownership interest in Suburban Energy Finance Corp (in hundredths) |  | 100.00% |  |
Long-term borrowings |  | $ 1,253,905 | $ 1,198,766 | $ 80,645
Consolidated fixed charge coverage ratio, minimum |  | 1.75 |  |
Long-term debt maturities, 2024 |  | $ 0 |  |
Long-term debt maturities, 2025 |  | 186,800 |  |
Long-term debt maturities, 2026 |  | 0 |  |
Long-term debt maturities, 2027 |  | 350,000 |  |
Long-term debt maturities, 2028 |  | 0 |  |
Long-term debt maturities, 2028 and thereafter |  | $ 730,645 |  |
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 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Margin over basis rate (in hundredths) |  | 1.00% |  |
Weighted average interest rate (in hundredths) |  | 7.90% |  |
Amended Credit Agreement Due 2025 [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] |  |  |  |
Maturity date | Mar. 05, 2025 | Mar. 05, 2025 |  |
Long-term borrowings |  | $ 186,800 | 132,000 |
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 |  | $ 33,586 |  |
Standby letters of credit issued under the Revolving Credit Facility, expiration date |  | Nov. 01, 2024 |  |
Revolving Credit Facility [Member] | Third Amended and Restated Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  | $ 186,800 | $ 132,000 |
Credit Facility, maximum amount | $ 500,000 |  |  |
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 |
5.00% Senior Notes due June 1, 2031 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (in hundredths) |  | 5.00% | 5.00% |
Maturity date |  | Jun. 01, 2031 | Jun. 01, 2031 |
Date public offering completed |  | May 24, 2021 |  |
Ownership interest in Suburban Energy Finance Corp (in hundredths) |  | 100.00% |  |
Percentage of principal amount at which debt was issued (in hundredths) |  | 100.00% |  |
Aggregate principal amount |  | $ 650,000 |  |
5.5% Senior Notes due June 1, 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (in hundredths) |  | 5.50% |  |
5.75% Senior Notes due March 1, 2025 [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] |  |  |  |
Stated interest rate (in hundredths) |  | 5.875% |  |
Maturity date |  | Mar. 01, 2027 |  |
Date public offering completed |  | Feb. 14, 2017 |  |
Ownership interest in Suburban Energy Finance Corp (in hundredths) |  | 100.00% |  |
Long-term borrowings |  | $ 350,000 | $ 350,000 |
Percentage of principal amount at which debt was issued (in hundredths) |  | 100.00% |  |
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] | 5.00% 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 |  |

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