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Fair Values Of Financial Instruments (Carrying Amount And Fair Value Of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2013
Carrying Amount [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt $ 925,052
Fair Value [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 909,448
Level 2 [Member] | Senior Notes, Net Of Unamortized Original Issue Discount [Member] | Carrying Amount [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 700,000
Level 2 [Member] | Senior Notes, Net Of Unamortized Original Issue Discount [Member] | Fair Value [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 684,250
Level 2 [Member] | Recovery Zone Facility Bonds [Member] | Carrying Amount [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 99,740
Level 2 [Member] | Recovery Zone Facility Bonds [Member] | Fair Value [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 99,740
Level 2 [Member] | Real Estate And Equipment Notes Payable [Member] | Carrying Amount [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 110,877
Level 2 [Member] | Real Estate And Equipment Notes Payable [Member] | Fair Value [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 111,023
Level 2 [Member] | Line Of Credit Payable [Member] | Carrying Amount [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt 14,435
Level 2 [Member] | Line Of Credit Payable [Member] | Fair Value [Member]
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated fair value of debt $ 14,435