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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