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Stock-based compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Number of Options
Beginning balance (in shares)	45,817,252
Granted (in shares)	9,316,926
Exercised (in shares)	(2,657,436)
Forfeited (in shares)	(3,971,280)
Expired (in shares)	(1,280)
Ending balance (in shares)	48,504,182	45,817,252
Weighted Average Exercise Price
Beginning balance (in USD per share)	$ 9.20
Granted (in USD per share)	15.12
Exercised (in USD per share)	3.52
Forfeited (in USD per share)	13.14
Expired (in USD per share)	15.11
Ending balance (in USD per share)	$ 10.33	$ 9.20
Additional Information
Weighted Average Remaining Contractual Term	6 years 7 months 6 days	6 years 10 months 24 days
Weighted Average Intrinsic Value	$ 276,959	$ 199,663
Options exercisable	31,194,219
Option exercisable - Weighted Average Exercise Price (in USD per share)	$ 8.13
Option exercisable - Weighted Average Remaining Contractual Term	5 years 4 months 24 days
Options exercisable - Weighted Average Intrinsic Value	$ 246,847
Options vested and expected to vest	45,662,090
Options vested and expected to vest - Weighted Average Exercise Price (in USD per share)	$ 10.07
Options vested and expected to vest - Weighted Average Remaining Contractual Term	6 years 6 months
Options vested and expected to vest - Weighted Average Intrinsic Value	$ 272,699

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