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Long-Term Borrowings - Additional Information (Details) |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 01, 2017 | Feb. 14, 2017 USD ($) | Mar. 03, 2016 USD ($) | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jun. 24, 2017 USD ($) | Jun. 25, 2016 USD ($) | Mar. 26, 2016 USD ($) | Jun. 24, 2017 USD ($) | Jun. 25, 2016 USD ($) | Sep. 24, 2016 USD ($) | Aug. 06, 2013 USD ($) | Aug. 02, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Suburban Energy Finance Corp (in hundredths) |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 1,567,000 | $ 292,000 |  |  |  |
Long-term borrowings |  |  |  |  |  |  |  |  |  | 1,250,159,000 |  |  | $ 1,250,159,000 |  | $ 1,224,502,000 | [1] |  |
Consolidated interest coverage ratio, minimum |  |  |  |  |  |  |  |  |  |  |  |  | 2.5 |  |  |  |  |
Total consolidated leverage ratio, maximum |  |  |  |  |  |  |  |  |  |  |  |  | 5.5 |  |  |  |  |
Senior secured unconsolidated leverage ratio maximum |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 |  |  |  |  |
Margin over basis rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Notional Amount |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  | $ 100,000,000 |  |  |  |  |
Consolidated fixed charge coverage ratio, minimum |  |  |  |  |  |  |  |  |  |  |  |  | 1.75 |  |  |  |  |
Long-term debt maturities, 2017 |  |  |  |  |  |  |  |  |  | 0 |  |  | $ 0 |  |  |  |  |
Long-term debt maturities, 2018 |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Long-term debt maturities, 2019 |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Long-term debt maturities, 2020 |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Long-term debt maturities, 2021 |  |  |  |  |  |  |  |  |  | 141,145,000 |  |  | 141,145,000 |  |  |  |  |
Long-term debt maturities, 2021 and thereafter |  |  |  |  |  |  |  |  |  | 1,125,000,000 |  |  | 1,125,000,000 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit issued under the Revolving Credit Facility |  |  |  |  |  |  |  |  |  | $ 43,256,000 |  |  | $ 43,256,000 |  |  |  |  |
Amended Credit Agreement Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 3.60% |  |  | 3.60% |  |  |  |  |
Amended Credit Agreement Due 2021 [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |
Description of applicable interest rate on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | Federal Funds Rate |  |  |  |  |
Amended Credit Agreement Due 2021 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Description of applicable interest rate on borrowings |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |
Amendment to Amended Credit Agreement Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated leverage ratio, maximum |  |  |  |  |  |  |  |  |  | 5.95 |  |  | 5.5 |  |  |  |  |
Amendment to Amended Credit Agreement Due 2021 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated leverage ratio, maximum |  |  |  | 5.5 | 5.75 | 5.95 | 5.95 | 5.95 | 5.95 |  |  |  |  |  |  |  |  |
Amendment to Amended Credit Agreement Due 2021 [Member] | Eurodollar Rate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis rate (in hundredths) | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment to Amended Credit Agreement Due 2021 [Member] | Letter of Credit Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis rate (in hundredths) | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment to Amended Credit Agreement Due 2021 [Member] | Base Rate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis rate (in hundredths) | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment to Amended Credit Agreement Due 2021 [Member] | Commitment Fee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis rate (in hundredths) | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended Credit Agreement Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective date |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 25, 2013 |  |  |  |  |
Termination date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 05, 2017 |  |  |  |  |
Fixed interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 1.63% |  |  | 1.63% |  |  |  |  |
7.375% Senior Notes due August 1, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date public offering completed |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2012 |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 503,443,000 |  |  | $ 503,443,000 |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 7.375% |  |  | 7.375% |  | 7.375% |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2021 |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,863,000 | $ 133,400,000
Loss on debt extinguishment |  | $ 1,567,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption premium and related fees |  | 15,078,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off unamortized debt origination costs |  | 2,272,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off unamortized premium |  | $ (15,783,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term borrowings |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  | $ 363,172,000 | [1] |  |
5.5% Senior Notes due June 1, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date public offering completed |  |  |  |  |  |  |  |  |  |  |  |  | May 27, 2014 |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 525,000,000 |  |  | $ 525,000,000 |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 5.50% |  |  | 5.50% |  | 5.50% |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2024 |  |  |  |  |
Percentage of principal amount at which debt was issued (in hundredths) |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |
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 |  |  |  |  |
Long-term borrowings |  |  |  |  |  |  |  |  |  | $ 525,000,000 |  |  | $ 525,000,000 |  | $ 525,000,000 | [1] |  |
7.5% Senior Notes due October 1, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 7.50% |  |  | 7.50% |  |  |  |  |
5.75% Senior Notes due March 1, 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date public offering completed |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 25, 2015 |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  | $ 250,000,000 |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 5.75% |  |  | 5.75% |  | 5.75% |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 01, 2025 |  |  |  |  |
Percentage of principal amount at which debt was issued (in hundredths) |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |
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 |  |  |  |  |
Long-term borrowings |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  | $ 250,000,000 |  | $ 250,000,000 | [1] |  |
7.375% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 7.375% |  |  | 7.375% |  |  |  |  |
5.875% Senior Notes due March 1, 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date public offering completed |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 14, 2017 |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  | $ 350,000,000 |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 5.875% |  |  | 5.875% |  | 5.875% |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 01, 2027 |  |  |  |  |
Percentage of principal amount at which debt was issued (in hundredths) |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |
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 |  |  |  |  |
Long-term borrowings |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  | $ 350,000,000 |  | $ 0 | [1] |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term borrowings |  |  |  |  |  |  |  |  |  | $ 141,145,000 |  |  | $ 141,145,000 |  | $ 100,000,000 |  |  |
Revolving Credit Facility [Member] | Amended Credit Agreement Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off unamortized debt origination costs |  |  |  |  |  |  |  |  |  |  |  | $ 292,000 |  |  |  |  |  |
Credit Facility, maximum amount |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, term |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Long-term borrowings as of September 24, 2016 reflect the retrospective impact from the adoption of new accounting guidance regarding the balance sheet classification of debt issuance costs (See Note 2).

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