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Long-Term Borrowings - Additional Information (Details) - USD ($) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 25, 2015 | May. 27, 2014 | Sep. 26, 2015 | Sep. 27, 2014 | Sep. 28, 2013 | Aug. 06, 2013 | Aug. 02, 2013 | Aug. 01, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Ownership interest in Suburban Energy Finance Corp (in hundredths) |  |  | 100.00% |  |  |  |  |
Loss on debt extinguishment |  |  | $ 15,072,000 | $ 11,589,000 | $ 2,144,000 |  |  |
Long-term borrowings |  |  | $ 1,241,107,000 | 1,242,685,000 |  |  |  |
Consolidated interest coverage ratio, minimum |  |  | 2.5 |  |  |  |  |
Total consolidated leverage ratio, maximum |  |  | 4.75 |  |  |  |  |
Consolidated leverage ratio during acquisition period, maximum |  |  | 5.0 |  |  |  |  |
Notional Amount |  |  | $ 100,000,000 |  |  |  |  |
Consolidated fixed charge coverage ratio, minimum |  |  | 1.75 |  |  |  |  |
Capitalized debt origination costs |  |  | $ 18,458,000 | 21,023,000 |  |  |  |
Long-term debt maturities, 2016 |  |  | 0 |  |  |  |  |
Long-term debt maturities, 2017 |  |  | 100,000,000 |  |  |  |  |
Long-term debt maturities, 2018 |  |  | 0 |  |  |  |  |
Long-term debt maturities, 2019 |  |  | 0 |  |  |  |  |
Long-term debt maturities, 2020 |  |  | 0 |  |  |  |  |
Long-term debt maturities, 2020 and thereafter |  |  | $ 1,121,180,000 |  |  |  |  |
Federal Funds Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Description of applicable interest rate on borrowings |  |  | Federal Funds Rate |  |  |  |  |
Basis spread (in hundredths) |  |  | 0.50% |  |  |  |  |
LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Description of applicable interest rate on borrowings |  |  | LIBOR |  |  |  |  |
Basis spread (in hundredths) |  |  | 1.00% |  |  |  |  |
Amended Credit Agreement Due 2017 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate (in hundredths) |  |  | 2.50% |  |  |  |  |
Effective date |  |  | Jun. 25, 2013 |  |  |  |  |
Termination date |  |  | Jan. 05, 2017 |  |  |  |  |
Fixed interest rate (in hundredths) |  |  | 1.63% |  |  |  |  |
Amended Credit Agreement Due 2017 [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Description of applicable interest rate on borrowings |  |  | Federal Funds Rate |  |  |  |  |
Basis spread (in hundredths) |  |  | 0.50% |  |  |  |  |
Amended Credit Agreement Due 2017 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Description of applicable interest rate on borrowings |  |  | LIBOR |  |  |  |  |
Basis spread (in hundredths) |  |  | 1.00% |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term borrowings |  |  | $ 100,000,000 | $ 100,000,000 |  |  |  |
Standby letters of credit issued under the Revolving Credit Facility |  |  | 46,183,000 |  |  |  |  |
Available borrowing capacity under Revolving Credit Facility |  |  | $ 253,817,000 |  |  |  |  |
Revolving Credit Facility [Member] | Amended Credit Agreement Due 2017 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, term |  |  | 5 years |  |  |  |  |
Credit Facility, maximum amount |  |  | $ 400,000,000 |  |  |  |  |
7.5% Senior Notes due October 1, 2018 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Date public offering completed |  |  | Aug. 01, 2012 |  |  |  |  |
Aggregate principal amount |  |  | $ 496,557,000 |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 7.50% |  |  |  |  |
Maturity date |  |  | Oct. 01, 2018 |  |  |  |  |
Fair value of debt at acquisition date (in hundredths) |  |  |  |  |  |  |  | 106.875%
Loss on debt extinguishment |  | $ 11,589,000 |  |  |  |  |  |
Redemption premium and related fees |  | 31,633,000 |  |  |  |  |  |
Write-off unamortized debt origination costs |  | 5,230,000 |  |  |  |  |  |
Write-off unamortized premium |  | $ (25,274,000) |  |  |  |  |  |
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 |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 7.375% | 7.375% |  |  |  |
Maturity date |  |  | Aug. 01, 2021 |  |  |  |  |
Fair value of debt at acquisition date (in hundredths) |  |  |  |  |  |  |  | 108.125%
Debt instrument repurchase amount |  |  |  |  |  | $ 23,863,000 | $ 133,400,000 |
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 |  |  |  |  |
Long-term borrowings |  |  | $ 366,107,000 | $ 368,868,000 |  |  |  |
7.375% Senior Notes due March 15, 2020 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Date public offering completed |  |  | Mar. 23, 2010 |  |  |  |  |
Aggregate principal amount |  |  | $ 250,000,000 |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 7.375% | 7.375% |  |  |  |
Maturity date |  |  | Mar. 15, 2020 |  |  |  |  |
Loss on debt extinguishment | $ 15,072,000 |  |  |  |  |  |  |
Redemption premium and related fees | 11,124,000 |  |  |  |  |  |  |
Write-off unamortized debt origination costs | 2,855,000 |  |  |  |  |  |  |
Percentage of principal amount at which debt was issued (in hundredths) |  |  | 99.136% |  |  |  |  |
Write-off unamortized discount | $ 1,093,000 |  |  |  |  |  |  |
Long-term borrowings |  |  |  | $ 248,817,000 |  |  |  |
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 |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 5.50% | 5.50% |  |  |  |
Maturity date |  |  | Jun. 01, 2024 |  |  |  |  |
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 |  |  |  |  |
Long-term borrowings |  |  | $ 525,000,000 | $ 525,000,000 |  |  |  |
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 |  |  |  |  |
Stated interest rate (in hundredths) |  |  | 5.75% |  |  |  |  |
Maturity date |  |  | Mar. 01, 2025 |  |  |  |  |
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 |  |  |  |  |
Long-term borrowings |  |  | $ 250,000,000 |  |  |  |  |

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