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v3.19.2

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
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Jun. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |
Shares used in basic per share computation | 52,745 | 53,008 | 52,641 | 52,876
Shares used in diluted per share computation | 53,872 | 54,195 | 53,849 | 54,111
Employee Stock Option |  |  |  |
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |
Effect of dilutive stock outstanding | 470 | 398 | 463 | 362
Restricted Stock Units (RSUs) |  |  |  |
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |
Effect of dilutive stock outstanding | 657 | 789 | 745 | 873

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