Restructuring Charges - Restructuring and Related Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 8,494	$ 1,122
Provision	5,291	22,721
Payments and other	(10,944)	(15,349)
Restructuring reserve, ending balance	2,841	8,494
Severance Related
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	8,279	836
Provision	2,468	9,172
Payments and other	(8,136)	(1,729)
Restructuring reserve, ending balance	2,611	8,279
Asset Write-Offs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Provision	2,194	12,609
Payments and other	(2,194)	(12,609)
Restructuring reserve, ending balance	0	0
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	215	286
Provision	629	940
Payments and other	(614)	(1,011)
Restructuring reserve, ending balance	$ 230	$ 215