Restructuring and Related Costs - Restructuring and Other Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			$ 21,608
Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	$ 1,504	$ 1,198	4,252	$ 24,528
Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	6,679	2,168	17,356	22,827
Severance and related expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			15,230
Severance and related expenses | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	1,489	(369)	4,165	21,593
Severance and related expenses | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	5,114	1,101	11,065	9,341
Lease related impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			5,779
Lease related impairment charges | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	13	1,155	71	1,155
Lease related impairment charges | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	1,365	1,113	5,708	13,532
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			431
Asset impairment | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	0	412	14	1,780
Asset impairment | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	34	$ (46)	417	$ (46)
Others
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			168
Others | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	2		2
Others | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	$ 166		$ 166