Intangible Assets - Summary of Activity in Intangible Assets and Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 428,952	$ 773,307
Currency translation adjustments	0	270
Impairments of intangible assets	(248)	(344,625)
Ending balance	428,704	428,952
Trade name, indefinite lived
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	3,400	3,400
Currency translation adjustments	0	0
Impairments of intangible assets	0	0
Ending balance	3,400	3,400
Total Goodwill
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	314,727	314,076
Currency translation adjustments	285	651
Impairments of intangible assets	0	0
Ending balance	315,012	314,727
Developed technology
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	179,682	251,673
Currency translation adjustments	0	270
Impairments of intangible assets	(248)	(72,261)
Ending balance	179,434	179,682
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	245,870	518,234
Currency translation adjustments	0	0
Impairments of intangible assets	0	(272,364)
Ending balance	$ 245,870	$ 245,870