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Summary of significant accounting policies - Percentage accounts receivable, revenue (Details)	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Customer A | Accounts receivable
Product Information [Line Items]
Concentration percentage	31.00%	26.00%
Customer A | Revenue
Product Information [Line Items]
Concentration percentage	17.00%	16.00%	17.00%
Customer B | Accounts receivable
Product Information [Line Items]
Concentration percentage	13.00%	16.00%
Customer C | Accounts receivable
Product Information [Line Items]
Concentration percentage	11.00%
Customer C | Revenue
Product Information [Line Items]
Concentration percentage	10.00%	12.00%	11.00%

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