Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Dec. 28, 2019
Changes in the carrying amount of goodwill
Balance at the beginning of the period, Goodwill gross	$ 164,921
Foreign currency translation adjustment and other (1)	(677)
Balance at the end of the period, Goodwill gross	159,720
Balance at the beginning of the period, Accumulated goodwill impairment	(76,417)
Goodwill, net	87,827	$ 88,504
Balance at the end of the period, Accumulated goodwill impairment	(71,893)
Balance at the end of the period, Goodwill, net	87,827
Decrease to goodwill from dissolution and final liquidation of GNU123 Liquidating Corporation	4,500
Decrease to accumulated impairment loss on goodwill from dissolution and final liquidation of GNU123 Liquidating Corporation	$ 4,500