Restructuring (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended				6 Months Ended		12 Months Ended
	Sep. 29, 2023	Jun. 30, 2023	Mar. 29, 2024	Dec. 29, 2023	Sep. 29, 2023	Mar. 31, 2023	Mar. 29, 2024	Mar. 31, 2023	Sep. 29, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ (2,495)			$ 33	$ 3,596	$ (211)	$ 47,061
Benefit recorded due to a true-up of estimated restructuring expenses			$ 2,500
September 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Impairment loss on internally developed software	$ 16,900
Minimum | September 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Gross pre-tax operating income savings							40,000
Minimum | June 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Gross pre-tax operating income savings							20,000
Maximum | September 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Gross pre-tax operating income savings							45,000
Maximum | June 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Gross pre-tax operating income savings							25,000
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges							7,513		23,943
Severance | September 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 7,400	$ 13,400
Severance | June 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 10,900
Leased facility exit costs and other costs and adjustments
Restructuring Cost and Reserve [Line Items]
Restructuring charges							$ (3,917)		$ 23,118
Leased facility exit costs and other costs and adjustments | New York, New York | June 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 6,900