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Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 650,672
Other comprehensive income (loss)	(2,713)	$ (73)	$ 399
Ending Balance	686,824	650,672
Unrealized Holding (Losses) Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(144)	(71)	(94)
Other comprehensive income (loss)	(786)	(73)	23
Ending Balance	(930)	(144)	(71)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,018)	(3,018)	(3,394)
Other comprehensive income (loss)	(1,927)		376
Ending Balance	(4,945)	(3,018)	(3,018)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,162)	(3,089)	(3,488)
Ending Balance	$ (5,875)	$ (3,162)	$ (3,089)

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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