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Long-Term Borrowings - Additional Information (Details) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 05, 2020 | Mar. 27, 2021 | Sep. 26, 2020
Debt Instrument [Line Items] |  |  |
Ownership interest in Suburban Energy Finance Corp (in hundredths) |  | 100.00% |
Long-term borrowings |  | $ 1,181,200,000 | $ 1,219,600,000
Consolidated fixed charge coverage ratio, minimum |  | 1.75 |
Long-term debt maturities, 2021 |  | $ 0 |
Long-term debt maturities, 2022 |  | 0 |
Long-term debt maturities, 2023 |  | 0 |
Long-term debt maturities, 2024 |  | 581,200,000 |
Long-term debt maturities, 2025 |  | 250,000,000 |
Long-term debt maturities, 2025 and 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% |
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) |  | 2.50% |
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] |  |  |
Long-term borrowings |  | $ 56,200,000 | 94,600,000
Maturity date | Mar. 05, 2025 | Mar. 05, 2025 |
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. |
Standby letters of credit issued under the Revolving Credit Facility |  | $ 53,612,000 |
Standby letters of credit issued under the Revolving Credit Facility, expiration date |  | Jan. 28, 2022 |
Revolving Credit Facility [Member] | Third Amended and Restated Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term borrowings |  | $ 56,200,000 | $ 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%
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 |
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 |
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] | 7.5% 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 |
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 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 |
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% |

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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