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Income taxes - Effective tax reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
U.S. federal income taxes at statutory rate | $ (226) | $ (3,570) | $ (5,778)
U.S. state and local income taxes | (9,315) | (1,441) | (2,454)
Foreign income tax rate differential | 129 | (53) | (1,101)
Dutch tax settlement | 0 | 0 | 7,361
Stock-based compensation | (2,399) | 4,025 | 1,503
Federal research tax credits | (8,418) | (4,333) | (2,978)
Unrecognized federal tax benefits | (2,806) | 1,990 | 1,191
Change in tax rate | 1,161 | 25,725 | 0
Net Impact of GILTI | 239 | 0 | 0
BEAT | 781 | 0 | 0
Other | 822 | 259 | 1,197
Change in valuation allowance | 23,722 | (21,546) | (1,232)
Provision for (benefit from) income taxes | $ 3,690 | $ 1,056 | $ (2,291)

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