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Income Taxes - Summary of Changes in Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 27, 2025 | Sep. 28, 2024 | Sep. 30, 2023
Valuation Allowance [Roll Forward] |  |  |
Beginning balance | $ 216,365 | $ 185,840 | $ 162,267
Increase during the period | 21,903 | 32,573 | 23,628
Decrease during the period | 0 | (2,048) | (55)
Ending balance | $ 238,268 | $ 216,365 | $ 185,840

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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