Maximum maturity period of highly liquid investment considered as cash equivalents.

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- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The average time remaining until maturity on the group of derivatives identified.

+ References

No definition available.

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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- Definition

Fair value of derivative liability, 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

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

The increase (decrease) of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issuances, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1), c(2), c(3)

-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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

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- Definition

The increase (decrease) of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issuances, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

+ References

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- Definition

Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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Financial Instruments and Risk Management (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	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