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Financial Instruments and Risk Management (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 29, 2012 | Dec. 24, 2011 | Dec. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] | Sep. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] | Dec. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] Commodity-Related Derivatives [Member] Other Current Assets [Member] | Sep. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] Commodity-Related Derivatives [Member] Other Current Assets [Member] | Dec. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] Commodity-Related Derivatives [Member] Other Assets [Member] | Sep. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] Commodity-Related Derivatives [Member] Other Assets [Member] | Dec. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] Commodity-Related Derivatives [Member] Other Current Liabilities [Member] | Sep. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] Commodity-Related Derivatives [Member] Other Current Liabilities [Member] | Dec. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] Commodity-Related Derivatives [Member] Other Liabilities [Member] | Sep. 29, 2012 Derivatives Not Designated as Hedging Instruments [Member] Commodity-Related Derivatives [Member] Other Liabilities [Member] | Dec. 29, 2012 Derivatives Designated as Hedging Instruments [Member] | Sep. 29, 2012 Derivatives Designated as Hedging Instruments [Member] | Dec. 29, 2012 Derivatives Designated as Hedging Instruments [Member] Interest Rate Swaps [Member] Other Current Liabilities [Member] | Sep. 29, 2012 Derivatives Designated as Hedging Instruments [Member] Interest Rate Swaps [Member] Other Current Liabilities [Member] | Dec. 29, 2012 Derivatives Designated as Hedging Instruments [Member] Interest Rate Swaps [Member] Other Liabilities [Member] | Sep. 29, 2012 Derivatives Designated as Hedging Instruments [Member] Interest Rate Swaps [Member] Other Liabilities [Member]
Financial Instruments and Risk Management [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum maturity period of highly liquid investment considered as cash equivalents | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over basis rate (in hundredths) | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value - assets |  |  | $ 2,837 | $ 5,133 | $ 2,670 | $ 4,523 | $ 167 | $ 610 |  |  |  |  |  |  |  |  |  |
Fair value - liabilities |  |  | 8,080 | 8,742 |  |  |  |  | 7,983 | 8,720 | 97 | 22 | 4,770 | 5,477 | 2,040 | 2,430 | 2,730 | 3,047
Reconciliation of beginning and ending balances of assets measured at fair value on recurring basis using significant unobservable inputs [Rollforward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance of over-the-counter options | 5,002 | 1,780 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance realized during the period | (2,195) | (54) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracts purchased during the period | 368 | 181 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in the fair value of beginning balance | (437) | (508) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance of over-the-counter options | 2,738 | 1,399 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of beginning and ending balances of liabilities measured at fair value on recurring basis using significant unobservable inputs [Rollforward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance of over-the-counter options | (1,209) | 118 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance realized during the period | (735) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracts purchased during the period | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in the fair value of beginning balance | (250) | (30) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance of over-the-counter options | $ (224) | $ 88 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average maturity of outstanding commodity-related derivatives | four months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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