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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
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Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares used in basic per share computation | 52,839 | 53,032 | 53,008 | 52,744 | 52,726 | 52,740 | 52,830 | 52,604 | 52,906 | 52,724 | 52,976
Shares used in diluted per share computation | 54,119 | 54,302 | 54,195 | 54,012 | 52,726 | 53,926 | 53,936 | 53,962 | 54,168 | 53,972 | 54,332
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive stock outstanding |  |  |  |  |  |  |  |  | 403 | 290 | 248
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive stock outstanding |  |  |  |  |  |  |  |  | 859 | 958 | 1,108

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