Restructuring costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021	Dec. 31, 2021
Restructuring Reserve [Roll Forward]
Beginning balance			$ 1,536
Expenses incurred	$ 1,007	$ 0	1,584	$ 0
Payments made			(2,170)
Ending balance	950		950		$ 1,536
Employee severance and temporary labor costs
Restructuring Reserve [Roll Forward]
Beginning balance			1,400
Expenses incurred			1,584
Payments made			(2,034)
Ending balance	950		950		1,400
Other charges
Restructuring Reserve [Roll Forward]
Beginning balance			136
Expenses incurred			0
Payments made			(136)
Ending balance	0		0		136
Restructuring Plan of 2021
Restructuring Cost and Reserve [Line Items]
Restructuring plan, expected costs	3,500		3,500
Restructuring Reserve [Roll Forward]
Expenses incurred	223		600		$ 2,487
Restructuring Plan Of 2022
Restructuring Cost and Reserve [Line Items]
Restructuring plan, expected costs	2,000		2,000
Restructuring Reserve [Roll Forward]
Expenses incurred	$ 784		$ 984