Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 24,736	$ 16,072	$ 65,000	$ 40,326
Other comprehensive income (loss)
Foreign currency translation adjustments, net of tax effects	401	345	(452)	1,561
Other comprehensive income (loss)	401	345	(452)	1,561
Comprehensive income	25,137	16,417	64,548	41,887
Less: comprehensive income attributable to non-controlling interest	424	0	1,094	0
Comprehensive income attributable to FOX stockholders	$ 24,713	$ 16,417	$ 63,454	$ 41,887