Fair Value Measurements (Carrying value and fair value of debt by hierarchy level) (Details) - Secured debt [Member] - Senior Secured Credit Facility [Member] - USD ($) $ in Thousands	Mar. 29, 2020	Dec. 29, 2019
Fair value, inputs, level 2 [Member] | Term loan A facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans payable, fair value disclosure	$ 397,156	$ 450,563
Fair value, inputs, level 2 [Member] | Revolving credit facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans payable, fair value disclosure	832,777	599,000
Carrying value measurement [Member] | Term loan A facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	443,750	450,000
Carrying value measurement [Member] | Revolving credit facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 975,000	$ 599,000