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Commitments and contingencies - Textual (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 10, 2017 patent | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Operating leases, rent expense | $ |  | $ 13.7 | $ 14.5 | $ 13.5
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating lease, term of contract |  | 1 year |  |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating lease, term of contract |  | 10 years |  |
Implicit, LLC |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Patents Allegedly Infringed, Number | patent | 2 |  |  |

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