Reconciles the Denominators of the Company's Calculation for Basic and Diluted Net Income per Share (Detail) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Jan. 01, 2021	Oct. 02, 2020	Jul. 03, 2020	Apr. 03, 2020	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Shares used in basic per share computation	52,402	52,316	52,259	52,575	52,681	52,802	52,745	52,536	52,388	52,691	52,906
Shares used in diluted per share computation	53,260	53,209	53,139	53,657	53,817	54,002	53,872	53,814	53,323	53,884	54,168
Employee Stock Option
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Effect of dilutive stock outstanding									333	458	403
Restricted Stock Units (RSUs)
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Effect of dilutive stock outstanding									602	735	859