CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 26, 2020	Sep. 28, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 81,241			$ 60,252			$ 10,703	$ 138,655
Other comprehensive income (loss):
Foreign currency translation adjustments	3,643			(2,347)			(5,768)	3,431
Comprehensive income	$ 84,884	$ 11,737	$ (91,686)	$ 57,905	$ 46,804	$ 37,377	$ 4,935	$ 142,086