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Financial Instruments and Risk Management (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Sep. 28, 2013
Derivative Instruments and Hedging Activities [Abstract]      
Maximum maturity period of highly liquid investment considered as cash equivalents 3 months    
Margin over basis rate (in hundredths) 1.00%    
Weighted average maturity of outstanding commodity-related derivatives 3 months   4 months
Derivatives, Fair Value [Line Items]      
Fair value - assets $ 8,984   $ 6,438
Fair value - liabilities 9,111   6,034
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 1,847 5,002 5,002
Beginning balance realized during the period (20) (2,195)  
Contracts purchased during the period 0 368  
Change in the fair value of beginning balance 1,058 (437)  
Ending balance of over-the-counter options 2,885 2,738 1,847
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 0 1,209 1,209
Beginning balance realized during the period 0 (735)  
Contracts purchased during the period 401 0  
Change in the fair value of beginning balance 0 (250)  
Ending balance of over-the-counter options 401 224 0
Commodity-Related Derivatives [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 6,367   3,634
Fair value - liabilities 4,253   802
Interest Rate Swaps [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 2,617   2,804
Fair value - liabilities 4,858   5,232
Derivatives Not Designated as Hedging Instruments [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 4,320   3,262
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Assets [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 4,320   2,546
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Assets [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 0   716
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Liabilities [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - liabilities 2,206   430
Derivatives Designated as Hedging Instruments [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - liabilities 2,241   2,428
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Current Liabilities [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - liabilities 1,314   1,307
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - liabilities $ 927   $ 1,121