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Fair Value Measurements (Outstanding Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 25, 2013
Dec. 25, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value $ 558,125 $ 558,125
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value 583,745 588,466
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Term Loan [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value 369,045 369,966
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value $ 214,700 $ 218,500