Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019	Oct. 09, 2019	Dec. 29, 2018
Business Acquisition [Line Items]
Goodwill	$ 200,293	$ 199,196		$ 189,214
FRT
Business Acquisition [Line Items]
Cash and cash equivalents			$ 1,687
Accounts receivable			3,079
Inventory			2,643
Property, plant and equipment			696
Operating lease, right of use assets			335
Prepaid expenses and other current assets			838
Tangible assets acquired			9,278
Customer deposits			(1,933)
Accounts payable and accrued liabilities			(1,182)
Operating lease liabilities			(335)
Deferred tax liabilities			(5,757)
Total tangible assets acquired and liabilities assumed			71
Intangible assets			17,429
Goodwill			11,123
Net Assets Acquired			$ 28,623