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Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Jun. 28, 2019 | Jun. 29, 2018 | Sep. 27, 2019 | Sep. 28, 2018
Cash paid during period: |  |  |  |  |  |
Income taxes |  |  |  |  | $ 14,884 | $ 19,721
Non-cash investing and financing activities: |  |  |  |  |  |
Unrealized gain (loss) on short-term investments | $ (30) | $ (31) | $ 403 | $ (21) | 373 | (52)
Vested stock unit awards issued to settle accrued bonuses |  |  |  |  | 7,947 | 7,643
Accrual for capital expenditures |  |  |  |  | 2,326 | $ 1,643
Right-of-use asset obtained in exchange for operating lease obligations |  |  |  |  | $ 28,678 |

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