Goodwill and Intangible Assets- Schedule of components of amortizable intangible assets (Details) - USD ($) $ in Thousands	Oct. 03, 2020	Sep. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73,235	$ 243,348
Accumulated Amortization	(51,470)	(158,535)
Net	21,765	84,813
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	46,547	193,704
Accumulated Amortization	(37,630)	(131,429)
Net	8,917	62,275
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,388	42,083
Accumulated Amortization	(12,923)	(21,512)
Net	11,465	20,571
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	5,261
Accumulated Amortization	0	(5,138)
Net	0	123
Production know-how
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,300	2,300
Accumulated Amortization	(917)	(456)
Net	$ 1,383	$ 1,844