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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Oct. 02, 2021
Oct. 03, 2020
Sep. 28, 2019
Sep. 29, 2018
Deferred tax assets        
Accrued expenses and reserves $ 18,601 $ 12,014    
Deferred revenue 13,915 11,831    
U.S. net operating loss carryforwards 25,284 8,242    
Foreign net operating loss carryforwards 13,240 12,183    
Research & development tax credit carryforwards 77,607 53,543    
Stock-based compensation 9,082 11,018    
Operating lease liability 9,908 14,377    
U.S. amortization 8,031 7,648    
Depreciation 1,875 1,101    
Other 428 603    
Total deferred tax assets 177,971 132,560    
Valuation allowance (155,978) (113,939) $ (95,088) $ (72,380)
Deferred tax assets, net of valuation allowance 21,993 18,621    
Deferred tax liabilities        
Tax accounting method change (962) (2,946)    
Right-of-use asset (7,388) (9,914)    
Foreign amortization (5,833) (6,093)    
Depreciation (32) (187)    
Other (144) (115)    
Total deferred tax liabilities (14,359) (19,255)    
Net deferred tax assets (liabilities) 7,634      
Net deferred tax assets (liabilities)   (634)    
Deferred tax assets 10,028 1,800    
Deferred tax liabilities $ (2,394) $ (2,434)