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Income taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Mar. 28, 2020
Mar. 30, 2019
Income Tax Disclosure [Abstract]        
Provision for (benefit from) income taxes $ (1,810) $ (213) $ (153) $ 2,242
Discrete income tax benefit $ 600