Retirement Benefit Plans Defined Contribution Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Defined Contribution Plan
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	75.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	4.00%
Defined Contribution Plan, Cost	$ 5,175	$ 4,631	$ 4,619