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Long-Term Borrowings - Additional Information (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 24, 2021 | Mar. 05, 2020 | Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019 | Feb. 25, 2015 | May 27, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Ownership interest in Suburban Energy Finance Corp (in hundredths) |  |  | 100.00% |  |  |  |
Long-term borrowings |  |  | $ 1,132,000,000 | $ 1,219,600,000 |  |  |
Loss on debt extinguishment |  |  | $ 16,029,000 | 109,000 | $ 0 |  |
Consolidated fixed charge coverage ratio, minimum |  |  | 1.75 |  |  |  |
Capitalized costs |  |  |  | 2,717,000 |  |  |
Long-term debt maturities, 2022 |  |  | $ 0 |  |  |  |
Long-term debt maturities, 2023 |  |  | 0 |  |  |  |
Long-term debt maturities, 2024 |  |  | 0 |  |  |  |
Long-term debt maturities, 2025 |  |  | 132,000,000 |  |  |  |
Long-term debt maturities, 2026 |  |  | 0 |  |  |  |
Long-term debt maturities, thereafter |  |  | $ 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) |  |  | 2.20% |  |  |  |
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 |  |  | $ 132,000,000 | 94,600,000 |  |  |
Maturity date |  | Mar. 05, 2025 | Mar. 05, 2025 |  |  |  |
Write-off unamortized debt origination costs |  |  | $ 109,000 |  |  |  |
Standby letters of credit issued under the Revolving Credit Facility |  |  | $ 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 |  |  | $ 132,000,000 | 94,600,000 |  |  |
Credit Facility, maximum amount |  | $ 500,000,000 |  |  |  |  |
Capitalized debt origination costs |  |  | $ 2,238,000 | $ 3,164,000 |  |  |
5.5% Senior Notes due June 1, 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 5.50% | 5.50% |  |  |
Maturity date |  |  | Jun. 01, 2024 |  |  |  |
5.75% Senior Notes due March 1, 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 5.75% | 5.75% |  |  |
Maturity date |  |  | Mar. 01, 2025 |  |  |  |
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 |  |  |  |
5.0% Senior Notes due June 1, 2031 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
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 |  |  |  |
Aggregate principal amount |  |  | $ 650,000,000 |  |  |  |
Debt instrument interest redemption percentage |  |  | 35.00% |  |  |  |
Redemption prices percentage |  |  | 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% |  |  |  |
Date public offering completed |  |  | May 27, 2014 |  |  |  |
Long-term borrowings |  |  |  | $ 525,000,000 |  |  | $ 525,000,000
Percentage of principal amount at which debt was issued (in hundredths) |  |  | 100.00% |  |  |  |
Maturity date |  |  | Jun. 01, 2024 |  |  |  |
Redemption premium and related fees | 6,217,000 |  |  |  |  |  |
Write-off unamortized debt origination costs | 2,855,000 |  |  |  |  |  |
Senior Notes [Member] | 7.5% Senior Notes due October 1, 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 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% |  |  |  |
Date public offering completed |  |  | Feb. 25, 2015 |  |  |  |
Long-term borrowings |  |  |  | 250,000,000 |  | $ 250,000,000 |
Percentage of principal amount at which debt was issued (in hundredths) |  |  | 100.00% |  |  |  |
Maturity date |  |  | Mar. 01, 2025 |  |  |  |
Redemption premium and related fees | 5,241,000 |  |  |  |  |  |
Write-off unamortized debt origination costs | $ 1,716,000 |  |  |  |  |  |
Senior Notes [Member] | 7.375% Senior Notes due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 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% |  |  |  |
Date public offering completed |  |  | Feb. 14, 2017 |  |  |  |
Long-term borrowings |  |  | $ 350,000,000 | $ 350,000,000 |  |  |
Percentage of principal amount at which debt was issued (in hundredths) |  |  | 100.00% |  |  |  |
Maturity date |  |  | Mar. 01, 2027 |  |  |  |
Aggregate principal amount |  |  | $ 350,000,000 |  |  |  |
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 |  |  | $ 650,000,000 |  |  |  |
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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