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Income taxes - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Deferred tax assets        
Accrued expenses and reserves $ 5,639 $ 8,828    
Deferred revenue 10,317 218    
Inventory deferral 0 3,259    
U.S. net operating loss carryforwards 18,385 53,589    
Foreign net operating loss carryforwards 5,625 1,147    
Tax credit carryforwards 22,969 17,553    
Stock-based compensation 7,237 7,976    
Amortization 3,237 3,859    
Other 427 324    
Total deferred tax assets 73,836 96,753    
Valuation allowance (72,380) (94,956) $ (95,882) $ (33,264)
Deferred tax assets, net of valuation allowance 1,456 1,797    
Deferred tax liabilities        
Depreciation (515) (690)    
Total deferred tax liabilities (515) (690)    
Net deferred tax assets $ 941 $ 1,107