Fair Value Measurements (Outstanding Borrowings) (Details) - USD ($) $ in Thousands	Dec. 27, 2016	Dec. 29, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	$ 579,985	$ 581,169
Fair Value, Measurements, Recurring | Level 2 Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instruments at fair value	587,860	584,757
Fair Value, Measurements, Recurring | Level 2 Inputs | Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instruments at fair value	393,867	389,670
Fair Value, Measurements, Recurring | Level 2 Inputs | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instruments at fair value	193,992	195,087
Fair Value, Measurements, Recurring | Level 2 Inputs | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instruments at fair value	$ 0	$ 0