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Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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Vested Restricted Stock Awards Issued to Settle Accrued Bonuses

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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