Reconciles the Denominators of the Company's Calculation for Basic and Diluted Net Income per Share (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Shares used in basic per share computation	52,637	52,259	52,587	52,417
Shares used in diluted per share computation	53,285	53,139	53,313	53,404
Employee Stock Option
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Effect of dilutive stock outstanding	232	340	234	360
Restricted Stock Units (RSUs)
Schedule Of Earnings Per Share Basic and Diluted [Line Items]
Effect of dilutive stock outstanding	416	540	492	627