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Financial Instruments and Risk Management (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Jun. 28, 2014
Jun. 29, 2013
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 6 months   4 months
Derivatives, Fair Value [Line Items]      
Fair value - assets $ 6,080   $ 6,438
Fair value - liabilities 5,850   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 (773) (3,933)  
Contracts purchased during the period 1,141 984  
Change in the fair value of outstanding contracts (85) (544)  
Ending balance of over-the-counter options 2,130 1,509 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 (1,162)  
Contracts purchased during the period 0 0  
Change in the fair value of outstanding contracts 0 (43)  
Ending balance of over-the-counter options 0 4 0
Commodity-Related Derivatives [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 4,086   3,634
Fair value - liabilities 1,788   802
Interest Rate Swaps [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 1,994   2,804
Fair value - liabilities 4,062   5,232
Derivatives Not Designated as Hedging Instruments [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 2,732   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 2,628   2,546
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Assets [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - assets 104   716
Derivatives Not Designated as Hedging Instruments [Member] | Commodity-Related Derivatives [Member] | Other Current Liabilities [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - liabilities 434   430
Derivatives Designated as Hedging Instruments [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - liabilities 2,068   2,428
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Current Liabilities [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - liabilities 1,335   1,307
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value - liabilities $ 733   $ 1,121