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Long-Term Borrowings (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  |  |  | 9 Months Ended |  | 9 Months Ended |
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Jun. 29, 2013 | Jun. 23, 2012 | Mar. 30, 2013 | Jun. 29, 2013 | Jun. 23, 2012 | Sep. 29, 2012 | Jun. 29, 2013 Amended Credit Agreement Due 2017 [Member] | Jun. 29, 2013 Amended Credit Agreement Due 2017 [Member] LIBOR [Member] | Jun. 29, 2013 Amended Credit Agreement Due 2017 [Member] Federal Funds Rate [Member] | Jun. 29, 2013 Revolving Credit Facility [Member] | Sep. 29, 2012 Revolving Credit Facility [Member] | Jun. 29, 2013 Senior Notes Due 2018 [Member] | Sep. 29, 2012 Senior Notes Due 2018 [Member] | Aug. 01, 2012 Senior Notes Due 2018 [Member] | Jun. 29, 2013 Senior Notes Due 2020 [Member] | Sep. 29, 2012 Senior Notes Due 2020 [Member] | Sep. 28, 2013 7.375% senior notes due August 1, 2021 [Member] | Jun. 29, 2013 7.375% senior notes due August 1, 2021 [Member] | Aug. 06, 2013 7.375% senior notes due August 1, 2021 [Member] | Aug. 02, 2013 7.375% senior notes due August 1, 2021 [Member] | Sep. 29, 2012 7.375% senior notes due August 1, 2021 [Member] | Aug. 01, 2012 7.375% senior notes due August 1, 2021 [Member] | Jun. 29, 2013 Amended Credit Agreement [Member] 364-Day Facility [Member] | Aug. 01, 2012 Amended Credit Agreement [Member] 364-Day Facility [Member] | Jun. 29, 2013 Amended Credit Agreement [Member] Revolving Credit Facility [Member] | Aug. 01, 2012 Amended Credit Agreement [Member] Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term borrowings | $ 1,416,051 |  |  | $ 1,416,051 |  | $ 1,422,078 |  |  |  | $ 100,000 | $ 100,000 | $ 526,377 | $ 529,923 |  | $ 248,547 | $ 248,385 |  | $ 541,127 |  |  | $ 543,770 |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  | 7.375% |  |  | 7.375% |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  | Jan. 05, 2017 |  | Oct. 01, 2018 |  |  | Mar. 15, 2020 |  |  | Aug. 01, 2021 |  |  |  |  |  |  |  |
Ownership interest in Suburban Energy Finance Corp (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Net unamortized premium |  |  |  |  |  |  |  |  |  |  |  | 29,820 | 33,366 |  |  |  |  | 37,684 |  |  | 40,327 |  |  |  |  |
Net unamortized discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,453 | 1,615 |  |  |  |  |  |  |  |  |  |
Date public offering completed |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2012 |  |  | Mar. 23, 2010 |  |  | Aug. 01, 2012 |  |  |  |  |  |  |  |
Percentage of interest owned in subsidiary (in hundredths) | 100.00% |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | 496,557 |  |  | 250,000 |  |  | 503,443 |  | 157,300 |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,900 | 133,400 |  |  |  |  |  |
Loss on debt extinguishment | 0 | 0 |  | 0 | (507) |  |  |  |  |  |  |  |  |  |  |  | 2,147 |  |  |  |  |  |  |  |  |
Debt instrument repurchase premium and related fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,761 |  |  |  |  |  |  |  |  |
Amortization of financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,067 |  |  |  |  |  |  |  |  |
Unamortized premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,681) |  |  |  |  |  |  |  |  |
Fair value of debt at acquisition date (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 106.875% |  |  |  |  |  |  |  | 108.125% |  |  |  |
Percentage of principal amount at which debt was issued (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.136% |  |  |  |  |  |  |  |  |  |  |
Percentage of the principal amount repurchase offer under change of control provision (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |
Number of days after the consummation of the change of control that a rating decline may occur to trigger offer to repurchase debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Credit Facility, maximum amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 | 250,000 | 400,000 | 400,000
Amount drawn under credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000 |  |  |
Term Of Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 364 days |  |
Repayments of short-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000 |  |  |
Standby letters of credit issued under the Revolving Credit Facility |  |  |  |  |  |  |  |  |  | 49,242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity under Revolving Credit Facility |  |  |  |  |  |  |  |  |  | 250,758 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowings | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility and 2020 Senior Notes covenants [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated interest coverage ratio, minimum |  |  |  | 2.0 to 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated leverage ratio, maximum |  |  |  | 7.0 to 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated fixed charge coverage ratio, minimum |  |  |  | 1.75 to 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Consolidated fixed charge coverage ratio, minimum |  |  |  | 2.5 to 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Consolidated fixed charge coverage ratio, minimum |  |  | 4.75 to 1.0 | 4.75 to 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Consolidated fixed charge coverage ratio during acquisition period, minimum |  |  | 5.0 to 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  | LIBOR | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis rate (in hundredths) | 1.00% |  |  |  |  |  |  | 1.00% | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (in hundredths) |  |  |  |  |  |  | 2.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount | 100,000 |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective date | Mar. 31, 2010 |  |  |  |  |  | Jun. 25, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination date | Jun. 25, 2013 |  |  |  |  |  | Jan. 05, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate (in hundredths) | 3.12% |  |  | 3.12% |  |  | 1.63% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt maturities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt maturities, 2013 | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt maturities, 2014 | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt maturities, 2015 | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt maturities, 2016 | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt maturities, 2017 | 100,000 |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt maturities, 2018 and thereafter | $ 1,250,000 |  |  | $ 1,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Number of days following a change of control, as defined in the indenture, that a rating decline (a decrease in the rating of the notes by either Moody's Investors Service or Standard and Poor's Rating group by one or more gradations) can occur to trigger repurchase offer. + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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