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Commitments and contingencies - Warranty liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]      
Warranty liability at beginning of year $ 2,437 $ 2,491 $ 2,722
Provision for warranties issued during the year 10,678 5,867 5,412
Settlements of warranty claims during the year (10,665) (5,921) (5,643)
Warranty liability at end of year $ 2,450 $ 2,437 $ 2,491