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Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Cash paid during period: |  |  |
Income taxes | $ 28,636 | $ 25,849 | $ 22,280
Non-cash investing and financing activities: |  |  |
Unrealized gain (loss) on investments | 191 | (90) | (81)
Vested stock unit awards granted to settle accrued bonus | 7,643 | 6,910 | 6,334
Accrual for capital expenditures | $ 1,231 | $ 148 | $ 284

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