Employee Stock Plans - Summary of Restricted Stock Unit, Performance Stock Units and Restricted Stock Award Activity (Detail) - Restricted Stock Unit, Performance Stock Units and Restricted Stock Award [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 26, 2020	Dec. 27, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested RSUs, PSUs and RSAs, Number of Shares, Beginning balance	1,800,000
Granted, Number of Shares	900,000
Vested, Number of Shares	(600,000)
Forfeited, Number of Shares	(100,000)
Unvested RSUs, PSUs and RSAs, Number of Shares, Ending balance	2,000,000.0
Vested and expected to vest RSUs, PSUs and RSAs,Numbers of Shares	1,700,000
Unvested RSUs, PSUs and RSAs, Aggregate Intrinsic Value	$ 44.5	$ 41.9
Vested and expected to vest RSUs, PSUs and RSAs, Aggregate Intrinsic Value	$ 38.7