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Financial Instruments and Risk Management (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 29, 2013 | Jun. 29, 2013 | Jun. 23, 2012 | Sep. 29, 2012
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% |  |  |
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 |  | (3,933) | (758) |
Contracts purchased during the period |  | 984 | 3,245 |
Change in the fair value of beginning balance |  | (544) | 2,678 |
Ending balance of over-the-counter options | 1,509 | 1,509 | 6,945 |
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 |  | (1,162) | (15) |
Contracts purchased during the period |  | 0 | 259 |
Change in the fair value of beginning balance |  | (43) | 669 |
Ending balance of over-the-counter options | 4 | 4 | 1,031 |
Weighted average maturity of outstanding commodity-related derivatives | 6 months | 6 months |  | 4 months
Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value - assets | 1,594 | 1,594 |  | 5,133
Fair value - liabilities | 749 | 749 |  | 8,742
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value - assets | 1,020 | 1,020 |  | 4,523
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value - assets | 574 | 574 |  | 610
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value - liabilities | 745 | 745 |  | 8,720
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value - liabilities | 4 | 4 |  | 22
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value - liabilities | 2,201 | 2,201 |  | 5,477
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Current Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value - liabilities | 1,276 | 1,276 |  | 2,430
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value - liabilities | $ 925 | $ 925 |  | $ 3,047

X
- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum maturity period of highly liquid investment considered as cash equivalents. + References No definition available. + Details
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