Benefit Plan (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2018	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Compensation And Retirement Disclosure [Abstract]
Percentage of pre-tax annual compensation contributed to the plan		15.00%
Percentage of matching contributions of employee	40.00%		25.00%	25.00%
Percentage of matching contributions of employee's gross salary	6.00%		6.00%	4.00%
Company's matching contributions		$ 1.1	$ 0.5	$ 0.6