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Income taxes Income taxes - Components of provision (benefit) for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Current:        
U.S. Federal $ 0 $ 0 $ 129  
U.S. State 177 62 59  
Foreign 816 (3,791) 3,344  
Total current 993 (3,729) 3,532  
Deferred:        
U.S. Federal (168) 0 0  
U.S. State 0 0 0  
Foreign 231 1,438 (888)  
Total deferred 63 1,438 (888)  
Provision for (benefit from) income taxes $ 1,056 $ (2,291) $ 2,644 $ 3,242