Employee Stock Plans - Stock-Based Compensation Expense Included in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 01, 2022	Jun. 25, 2021	Jul. 01, 2022	Jun. 25, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation		$ 4.5	$ 3.7	$ 10.1	$ 7.2
Income tax benefit		(3.0)	(0.9)	(6.6)	(1.7)
Stock-based compensation expense, net of tax		1.5	2.8	3.5	5.5
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	[1]	0.5	0.4	1.0	0.9
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation		0.1	0.0	0.2	0.1
Sales and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation		0.3	0.4	0.6	0.7
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation		$ 3.6	$ 2.9	$ 8.3	$ 5.5

[1] Stock-based compensation expense capitalized in inventory for the three and six months ended July 1, 2022 and June 25, 2021 and June 25, 2021 was not significant.