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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 27, 2025
Sep. 28, 2024
Sep. 30, 2023
Oct. 01, 2022
Deferred tax assets        
Capitalized research & development $ 131,858 $ 107,474    
Research & development tax credit carryforwards 51,752 58,156    
Accrued expenses and reserves 18,979 17,070    
Deferred revenue 14,363 15,374    
Operating lease liability 13,165 14,259    
Other capitalized costs 12,448 12,030    
Stock-based compensation 6,973 8,195    
Foreign net operating loss carryforwards 5,293 5,783    
Depreciation 4,098 2,991    
U.S. net operating loss carryforwards 3,889 2,296    
Total deferred tax assets 370 592    
Total deferred tax assets 263,188 244,220    
Valuation allowance (238,268) (216,365) $ (185,840) $ (162,267)
Deferred tax assets, net of valuation allowance 24,920 27,855    
Deferred tax liabilities        
Right-of-use asset (9,788) (10,955)    
Intangibles (2,675) (3,392)    
Capitalized inventory (2,074) (3,254)    
Total deferred tax liabilities (14,537) (17,601)    
Deferred tax assets 10,509 10,314    
Deferred tax liabilities (126) (60)    
Net deferred tax assets $ 10,383 $ 10,254