Fair Value Measurements and Financial Instruments - Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 03, 2020	Apr. 03, 2020	Jan. 03, 2020	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit Facility	$ 406,393		$ 68,000
Non-controlling interest subject to put provisions	24,975	$ 16,207	15,719	$ 15,022	$ 14,581	$ 14,282
Total liabilities measured at fair value	431,368		83,719
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit Facility	0		0
Non-controlling interest subject to put provisions	0		0
Total liabilities measured at fair value	0		0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit Facility	406,393		68,000
Non-controlling interest subject to put provisions	0		0
Total liabilities measured at fair value	406,393		68,000
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit Facility	0		0
Non-controlling interest subject to put provisions	24,975		15,719
Total liabilities measured at fair value	$ 24,975		$ 15,719