Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21.00%		24.50%
Effective income tax rate reconciliation, at federal statutory income tax rate, blended percent		21.00%
Federal statutory tax expense (benefit)	$ (92,972)	$ 12,610	$ 88,684
Valuation allowance	15,231	7,925	4,263
Taxes on foreign earnings at rates greater (less) than U.S. rates, net	(27,041)	(8,210)	8,417
Stock-based compensation	3,640	556	(8,536)
State income taxes, net of federal income tax benefit	(1,249)	1,131	(373)
Research and development credit	(4,350)	(3,665)	(6,972)
Deferred compensation	(564)	(206)	(560)
Release of unrecognized tax benefits	(20,027)	(6,688)	(352)
Release of interest accrued for unrecognized tax benefits	(4,232)	(205)	(156)
Reversal of competent authority	8,552
U.S. tax reform impact	0	0	26,653
Deferred taxes on foreign earnings	1,303	1,215	0
Write-off of withholding tax credits	0	1,134	0
Goodwill impairment	89,962
Other, net	3,163	626	3,127
Provision for (benefit from) income taxes	$ (28,584)	$ 6,223	$ 114,195
Effective tax rate	6.50%	10.40%	31.60%