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401(k) Plan (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2018	Jan. 01, 2021	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
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%
Percentage of matching contributions of employee's gross salary	6.00%				6.00%
Company's matching contributions		$ 0.8	$ 0.8	$ 1.1

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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