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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Oct. 01, 2022
Oct. 02, 2021
Oct. 03, 2020
Sep. 28, 2019
Deferred tax assets        
Accrued expenses and reserves $ 8,872 $ 18,601    
Deferred revenue 14,170 13,915    
U.S. net operating loss carryforwards 26,363 25,284    
Foreign net operating loss carryforwards 7,702 13,240    
Research & development tax credit carryforwards 92,487 77,607    
Stock-based compensation 9,261 9,082    
Operating lease liability 7,717 9,908    
Capitalized research & development 9,420 3,409    
Other capitalized costs 3,799 4,622    
Depreciation 2,239 1,843    
Other 182 428    
Total deferred tax assets 182,212 177,939    
Valuation allowance (162,267) (155,978) $ (113,939) $ (95,088)
Deferred tax assets, net of valuation allowance 19,945 21,961    
Deferred tax liabilities        
Tax accounting method change   (962)    
Right-of-use asset (5,940) (7,388)    
Intangibles (22,125) (5,833)    
Other (14) (144)    
Total deferred tax liabilities (28,079) (14,327)    
Net deferred tax assets (liabilities)   7,634    
Net deferred tax assets (liabilities) (8,134)      
Deferred tax assets 1,508 10,028    
Deferred tax liabilities $ (9,642) $ (2,394)