Restructuring Charges - Narrative (Details) $ in Thousands			3 Months Ended				12 Months Ended
	Dec. 23, 2019 office	Dec. 29, 2018	Apr. 05, 2020 USD ($)	Dec. 29, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 30, 2018 USD ($)	Dec. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of employees		200
Restructuring charges							$ 20,500
Severance costs						$ 10,800
Asset impairment charges						8,600
Other restructuring costs						$ 1,100
Estimated restructuring costs remaining			$ 12,000
Restructuring Charges			(1,118)		$ 0
Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs remaining			10,800
2018 and 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				$ 8,400
2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees	105
Severance costs				8,800
Estimated restructuring costs remaining			9,000
Expected savings from restructuring			6,000
Restructuring Charges			409	9,000
Restructuring Reserve			7,383	8,773
2019 Restructuring Plan [Member] | Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Number Of Office Leases | office	2
Restructuring Charges			409
Restructuring Reserve			$ 7,244	8,634
2019 Restructuring Plan [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				$ 200