Number of Unvested Restricted Stock Unit Awards Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value, awards granted		$ 57.08	$ 40.61	$ 29.50
Unvested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, awards balance	[1]	1,034,539
Number of shares outstanding, awards granted	[1]	302,635
Number of shares outstanding, awards vested	[1]	(448,946)
Number of shares outstanding, awards forfeited	[1]	(1,933)
Number of shares outstanding, awards balance	[1]	886,295	1,034,539
Weighted-average grant date fair value, awards balance	[1]	$ 27.76
Weighted-average grant date fair value, awards granted	[1]	57.08
Weighted-average grant date fair value, awards vested	[1]	32.83
Weighted-average grant date fair value, awards forfeited	[1]	46.64
Weighted-average grant date fair value, awards balance	[1]	$ 35.16	$ 27.76
Weighted average remaining contractual term, Balance	[1]	1 year 4 months 24 days
Aggregate intrinsic value, Balance	[1],[2]	$ 62,448

[1] Does not include employee stock purchase plans or stock option plans.

[2] The intrinsic value is calculated as the market value as of the end of the fiscal period. As reported by the NASDAQ Global Select Market, the market value as of January 3, 2020 was $70.46.