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Long-Term Borrowings - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 26, 2020 | Mar. 05, 2020 | Sep. 28, 2019
Debt Instrument [Line Items] |  |  |
Ownership interest in Suburban Energy Finance Corp (in hundredths) | 100.00% |  |
Long-term borrowings | $ 1,219,600,000 |  | $ 1,238,500,000
Consolidated fixed charge coverage ratio, minimum | 1.75 |  |
Capitalized costs | $ 2,717,000 |  |
Long-term debt maturities, 2021 | 0 |  |
Long-term debt maturities, 2022 | 0 |  |
Long-term debt maturities, 2023 | 0 |  |
Long-term debt maturities, 2024 | 619,600,000 |  |
Long-term debt maturities, 2025 | 250,000,000 |  |
Long-term debt maturities, thereafter | $ 350,000,000 |  |
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% |  |
Amended Credit Agreement Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated interest coverage ratio, minimum | 2.5 |  |
Total consolidated leverage ratio, maximum | 5.75 |  |
Senior secured unconsolidated leverage ratio maximum | 3.25 |  |
Weighted average interest rate (in hundredths) | 2.80% |  |
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% |  |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Mar. 05, 2025 |  |
Long-term borrowings | $ 94,600,000 |  | 113,500,000
Debt instrument maturity description | earlier of (a) the date that is ninety-one (91) days prior to maturity of the 2024 Senior Notes (unless the notes have been refinanced prior to such date) and (b) March 5, 2025. |  |
Non cash charge recognized to write-off unamortized debt obligation costs | $ 109,000 |  |
Standby letters of credit issued under the Revolving Credit Facility | $ 63,088,000 |  |
Standby letters of credit issued under the Revolving Credit Facility, expiration date | Apr. 30, 2021 |  |
Write-off unamortized debt origination costs | $ 109,000 |  |
Revolving Credit Facility [Member] | Amended Credit Agreement Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit Facility, maximum amount |  | $ 500,000,000 |
Long-term borrowings | 94,600,000 | $ 183,900,000 |
Capitalized debt origination costs | $ 3,164,000 |  | $ 1,550,000
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 |  |
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 |  |
Aggregate principal amount | $ 525,000,000 |  |
Percentage of principal amount at which debt was issued (in hundredths) | 100.00% |  |
Maturity date | Jun. 01, 2024 |  |
Redemption start date | Jun. 01, 2019 |  |
Redemption description | The 2024 Senior Notes are redeemable, at the Partnership’s option, in whole or in part, at any time on or after June 1, 2019, 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 |  |
Long-term borrowings | $ 525,000,000 |  | $ 525,000,000
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 |  |
Aggregate principal amount | $ 250,000,000 |  |
Percentage of principal amount at which debt was issued (in hundredths) | 100.00% |  |
Maturity date | Mar. 01, 2025 |  |
Redemption start date | Mar. 01, 2020 |  |
Redemption description | The 2025 Senior Notes are redeemable, at the Partnership’s option, in whole or in part, at any time on or after March 1, 2020, 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 |  |
Long-term borrowings | $ 250,000,000 |  | 250,000,000
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 |  |
Aggregate principal amount | $ 350,000,000 |  |
Percentage of principal amount at which debt was issued (in hundredths) | 100.00% |  |
Maturity date | Mar. 01, 2027 |  |
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 |  |
Long-term borrowings | $ 350,000,000 |  | $ 350,000,000
Senior Notes [Member] | 7.375% Senior Notes due August 1, 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (in hundredths) | 7.375% |  |

X
- Definition The indenture governing the 2020 Senior Notes, requires the Partnership's consolidated fixed charge coverage ratio, as defined, to exceed a minimum ratio to permit the Partnership to make cash distributions equal to available cash, as defined, as of the end of the immediately preceding quarter, if no event of default exists or would exist upon making such distributions. + References No definition available. + Details
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