Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Compensation And Retirement Disclosure [Abstract]
Percentage of pre-tax annual compensation contributed to the plan	15.00%
Percentage of matching contributions of employee	25.00%	25.00%	25.00%
Percentage of matching contributions of employee's gross salary	4.00%	4.00%	4.00%
Company's matching contributions	$ 0.5	$ 0.6	$ 0.3