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

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)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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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

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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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)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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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.

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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)

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-Publisher FASB

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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.

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

-Publisher FASB

-Name Accounting Standards Codification

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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

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-Publisher FASB

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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.

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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

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-Paragraph 2

-Subparagraph (c)

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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Financial Instruments and Risk Management (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended				12 Months Ended															12 Months Ended													12 Months Ended
	Mar. 24, 2012	Mar. 26, 2011	Mar. 24, 2012	Mar. 26, 2011	Sep. 24, 2011	Sep. 25, 2010	Mar. 24, 2012 Commodity Options [Member] Cost of Sales [Member] Not Designated as Hedging Instrument [Member]	Mar. 26, 2011 Commodity Options [Member] Cost of Sales [Member] Not Designated as Hedging Instrument [Member]	Mar. 24, 2012 Commodity Options [Member] Cost of Sales [Member] Not Designated as Hedging Instrument [Member]	Mar. 26, 2011 Commodity Options [Member] Cost of Sales [Member] Not Designated as Hedging Instrument [Member]	Mar. 24, 2012 Commodity Futures [Member] Cost of Sales [Member] Not Designated as Hedging Instrument [Member]	Mar. 26, 2011 Commodity Futures [Member] Cost of Sales [Member] Not Designated as Hedging Instrument [Member]	Mar. 24, 2012 Commodity Futures [Member] Cost of Sales [Member] Not Designated as Hedging Instrument [Member]	Mar. 26, 2011 Commodity Futures [Member] Cost of Sales [Member] Not Designated as Hedging Instrument [Member]	Mar. 24, 2012 Interest Rate Swaps [Member] Interest Expense [Member] Derivatives in Cash Flow Hedging Relationships [Member] Designated as Hedging Instrument [Member]	Mar. 26, 2011 Interest Rate Swaps [Member] Interest Expense [Member] Derivatives in Cash Flow Hedging Relationships [Member] Designated as Hedging Instrument [Member]	Mar. 24, 2012 Interest Rate Swaps [Member] Interest Expense [Member] Derivatives in Cash Flow Hedging Relationships [Member] Designated as Hedging Instrument [Member]	Mar. 26, 2011 Interest Rate Swaps [Member] Interest Expense [Member] Derivatives in Cash Flow Hedging Relationships [Member] Designated as Hedging Instrument [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member]	Sep. 26, 2009 Not Designated as Hedging Instrument [Member]	Mar. 24, 2012 Not Designated as Hedging Instrument [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Cost of Sales [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Cost of Sales [Member]	Sep. 26, 2009 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Cost of Sales [Member]	Mar. 24, 2012 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Current Assets [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Current Assets [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Current Assets [Member]	Mar. 24, 2012 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Assets [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Assets [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Assets [Member]	Mar. 24, 2012 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Current Liabilities [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Current Liabilities [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Current Liabilities [Member]	Mar. 24, 2012 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Liabilities [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Liabilities [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Options [Member] Other Liabilities [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Cost of Sales [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Cost of Sales [Member]	Sep. 26, 2009 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Cost of Sales [Member]	Mar. 24, 2012 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Other Current Assets [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Other Current Assets [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Other Current Assets [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Other Assets [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Other Assets [Member]	Sep. 24, 2011 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Other Current Liabilities [Member]	Sep. 25, 2010 Not Designated as Hedging Instrument [Member] Commodity Futures [Member] Other Current Liabilities [Member]	Mar. 24, 2012 Designated as Hedging Instrument [Member]	Sep. 24, 2011 Designated as Hedging Instrument [Member]	Sep. 25, 2010 Designated as Hedging Instrument [Member]	Sep. 24, 2011 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Derivatives in Cash Flow Hedging Relationships [Member]	Sep. 25, 2010 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Derivatives in Cash Flow Hedging Relationships [Member]	Sep. 26, 2009 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Derivatives in Cash Flow Hedging Relationships [Member]	Sep. 24, 2011 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Interest Expense [Member] Derivatives in Cash Flow Hedging Relationships [Member]	Sep. 25, 2010 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Interest Expense [Member] Derivatives in Cash Flow Hedging Relationships [Member]	Sep. 26, 2009 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Interest Expense [Member] Derivatives in Cash Flow Hedging Relationships [Member]	Mar. 24, 2012 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Other Current Liabilities [Member]	Sep. 24, 2011 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Other Current Liabilities [Member]	Sep. 25, 2010 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Other Current Liabilities [Member]	Mar. 24, 2012 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Other Liabilities [Member]	Sep. 24, 2011 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Other Liabilities [Member]	Sep. 25, 2010 Designated as Hedging Instrument [Member] Interest Rate Swaps [Member] Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value - assets																			$ 5,454	$ 2,623		$ 1,282				$ 1,083	$ 3,710	$ 2,601	$ 0	$ 612	$ 0										$ 199	$ 1,132	$ 22	$ 0	$ 0
Fair value - liabilities																			2,476	2,479		31										31	2,407	641	0	69	0									0	1,838	3,637	4,596	6,301							2,638	2,662	2,740	999	1,934	3,561
Asset Fair Value Measurement Using Significant Unobservable Inputs (Level 3) [Roll Forward]
Beginning balance of over-the-counter options			1,780	1,509	1,509	1,675
Beginning balance realized during the period			(398)	(833)	(1,509)	(1,434)
Contracts purchased during the period			330	475	1,780	1,509
Change in the fair value of beginning balance			(770)	(41)	0	(241)
Ending balance of over-the-counter options	942	1,110	942	1,110	1,780	1,509
Liability Fair Value Measurement Using Significant Unobservable Inputs (Level 3) [Roll Forward]
Beginning balance of over-the-counter options			118	29	29	844
Beginning balance realized during the period			0	(11)	(29)	(844)
Contracts purchased during the period			0	0	118	29
Change in the fair value of beginning balance			(97)	(18)	0	0
Ending balance of over-the-counter options	21	0	21	0	118	29
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Unrealized Gains (Losses) Recognized in Income	0	4,123	(1,048)	2,550			(653)	766	(115)	799	653	3,357	(933)	1,751					1,431	(5,400)	1,713		(1,517)	(1,275)	(589)													2,948	(4,125)	2,302
Gains (Losses) Recognized in OCI (Effective Portion)	(695)	(352)	(378)	226											(695)	(352)	(378)	226																																	(1,177)	(5,706)	(4,079)
Gains (Losses) Reclassified from Accumulated OCI into Income (Effective Portion)	(642)	(704)	(1,338)	(1,428)											(642)	(704)	(1,338)	(1,428)																																				(2,881)	(3,597)	(3,088)
Weighted average maturity of outstanding commodity-related derivatives (in months)	5M		5M		4M	3M
Fair Value of 2020 Senior Notes	$ 270,000		$ 270,000		$ 248,500