Income Taxes - Reconciliation of Effective Income Tax Rate to Federal Rate (Detail)	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Federal income tax rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	2.40%	2.20%	5.80%	[1]
Change in Income Tax Classification	(27.30%)	0.00%	0.00%
Non-tax deductible impairments	0.90%	8.80%	3.50%
Foreign derived intangible income	(2.20%)	(3.60%)	(4.30%)
Income tax audits and reserves	(8.40%)	(2.40%)	1.30%
Tax rate differential on foreign income	3.40%	(1.60%)	0.10%
U.S. research and development credits	(0.90%)	(1.10%)	(1.10%)
Tax impact of equity awards	(0.30%)	0.80%	2.10%
Valuation Allowance	(1.30%)	(0.60%)	(1.80%)
Other, including tax reserves and related interest	0.80%	0.20%	2.30%
Effective Income Tax Rate, Continuing Operations, Total	(11.90%)	23.70%	28.90%

[1] Fiscal 2023 includes an adjustment related to certain deferred state taxes