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Income Taxes - Reconciliation of Income Tax (Benefit) at U.S. Federal Statutory Rate to Company's Effective Tax Rate (Details)	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Increase (decrease) in tax resulting from:
Income tax provision at federal statutory rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	2.20%	2.50%	4.10%
U.S. tax on foreign earnings	0.80%	0.50%	(1.00%)
Tax credits	(1.80%)	(1.60%)	(1.10%)
Unrecognized tax benefits	1.50%	3.90%	3.50%
Compensation	1.00%	1.00%	0.80%
Foreign rate differential	(9.00%)	(6.80%)	(4.80%)
Assets held-for-sale charge	0.00%	0.00%	1.50%
Change in valuation allowance	(4.00%)	2.70%	8.20%
Return to provision	1.80%	(1.20%)	(1.90%)
Expiration of tax loss carryforwards	3.70%	0.00%	0.00%
Worthless stock deduction	0.00%	(12.40%)	0.00%
Other	(0.20%)	(0.90%)	2.30%
Effective income tax rate	17.00%	8.70%	32.60%

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the difference in the deductibility or nondeductibility of executive compensation (i.e., those subject to Section 162(m) limitations), including equity-based compensation and salary and bonus compensation.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in unrecognized tax benefits recorded in the statement of operations

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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