Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 25, 2012	Dec. 27, 2011
Details of Debt
Carrying value	$ 564,063	$ 372,700
Less current portion	3,750	13,540
Long-term debt, Total	560,313	359,160
Term Loan [Member]
Details of Debt
Carrying value	374,063
Senior Notes [Member]
Details of Debt
Carrying value	190,000
Revolving Facility ($100 million) [Member]
Details of Debt
Carrying value
Old Term Loan [Member]
Details of Debt
Carrying value		197,700
Old Senior Subordinated Notes [Member]
Details of Debt
Carrying value		175,000
Old Revolving Facility ($75 million) [Member]
Details of Debt
Carrying value