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Commitments and contingencies - Textual (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 10, 2017 patent | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Oct. 03, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Operating leases, rent expense |  | $ 14,500 | $ 13,500 | $ 14,500 |
Warranty accrual |  | $ 2,450 | $ 2,437 | $ 2,491 | $ 2,722
Implicit, LLC |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Patents infringed upon | patent | 2 |  |  |  |
Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Operating lease, term of contract |  | 1 year |  |  |
Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Operating lease, term of contract |  | 10 years |  |  |

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