Restructuring Charges - Changes in Restructuring Reserves (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jan. 02, 2021	Jan. 01, 2022	Jan. 02, 2021
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 0	$ 0
Provision for restructuring reserves		319	$ 103
Cash payments made		(319)	(103)
Provision for restructuring charges associated with Photonics sale		2,604
Non-cash utilization		(1,485)
Ending balance	0	1,023	0
Severance And Other Employee Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	0	0
Provision for restructuring reserves		319	103
Cash payments made		(319)	(103)
Provision for restructuring charges associated with Photonics sale		693
Cash payments made		(96)
Non-cash utilization		(239)
Ending balance	0	358	0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	0	0
Provision for restructuring reserves	0
Cash payments made		0
Provision for restructuring charges associated with Photonics sale		1,911
Cash payments made		(96)
Non-cash utilization		(1,246)
Ending balance	$ 0	$ 665	$ 0