Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 12,908	$ 17,265	$ (4,315)	$ 33,669
Other comprehensive income (loss)
Foreign currency translation adjustments, net of tax	3,562	3,498	(1,338)	(1,333)
Unrealized gain (loss) on interest rate swap, net of tax	227	(2,042)	(1,975)	(3,124)
Total other comprehensive income (loss)	3,789	1,456	(3,313)	(4,457)
Comprehensive income (loss)	$ 16,697	$ 18,721	$ (7,628)	$ 29,212