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Income Taxes - Reconciliation of Effective Tax Rates (Detail)	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	24.50%	35.00%
Foreign rate differential	1.60%	5.10%	31.90%
State taxes net of federal benefit	0.90%	0.80%	0.20%
Warrant liabilities	0.00%	4.40%	(1.80%)
Change in valuation allowance	(2.40%)	34.00%	(270.00%)
Research and development credits	1.40%	9.00%	12.80%
Provision to return adjustments	0.30%	8.30%	(4.00%)
Effective income tax rate	9.30%	13.80%	(203.80%)
Effective Income Tax Rate Reconciliation Section 382 Adjustment	(19.30%)	0.00%	0.00%
Nondeductible compensation expense	(0.60%)	1.40%	(4.10%)
Global Intangible Low Taxed Income	(2.90%)	0.00%	0.00%
Nondeductible legal fees	0.00%	0.90%	(3.90%)
2017 tax reform	0.00%	(73.70%)	0.00%
Intra-entity license transfer	9.40%	0.00%	0.00%
Other permanent differences	(0.10%)	(0.90%)	0.10%

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