Revenue Recognition Effect of Adopting ASC 606 (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 28, 2019	Dec. 29, 2018
Effect of Adopting ASC 606 [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax		$ 100
Accounting Standards Update 2014-09
Effect of Adopting ASC 606 [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	[1]		$ 4,405

[1] As of December 31, 2017, the company adopted ASU No. 2014-09, Revenue from Contracts with Customers (ASC 606) using the modified retrospective method to contracts that were not completed as of December 30, 2017. The adoption of this guidance resulted in the recognition of $(4.4) million as an adjustment to the opening balance of retained earnings.