Restructuring and Other Charges - Narrative (Details) $ in Thousands			3 Months Ended					12 Months Ended
	Dec. 23, 2019 USD ($) office	Dec. 29, 2018 Employee	Dec. 29, 2019 USD ($)	Sep. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)	Apr. 02, 2017 USD ($)	Jan. 01, 2017 USD ($) Employee	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring, asset impairment and other charges								$ 12,947	$ 20,529	$ 7,299
Non-cash charges								5,000
Number of employees eliminated | Employee		200					70
Severance expenses					$ 10,800
Restructuring charges				$ 700		$ 7,300	$ 19,800
Restructuring plan, expected cost remaining				12,000
Other write-off	$ 5,000
Restructuring and asset impairment charges			$ 12,300	700	20,500
Asset impairment charges					8,600			0	8,569	$ 0
Other restructuring costs					1,100
Adjustment to previously recorded severance expense			(1,700)
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring plan, expected cost remaining				$ 10,800
2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Net reduction in restructuring reserve								1,000
Restructuring reserve			2,672		11,907			2,672	11,907
Restructuring charges								1,071
2018 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve			1,898		$ 10,763			1,898	$ 10,763
Restructuring charges								1,743
2018 and 2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve			11,400					11,400
2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve			8,773					8,773
Number of employees eliminated	105
Severance expenses			8,800
Restructuring charges			9,000
Restructuring plan, expected cost remaining			9,000					9,000
Restructuring, expected savings			6,000					6,000
2019 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve			8,634					$ 8,634
Number of offices | office	2
2019 Restructuring Plan | Lease Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 200