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Stock-based compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 29, 2018	Sep. 30, 2017	Sep. 29, 2018
Number of Options
Beginning balance (in shares)	48,504,182
Granted (in shares)	976,328
Exercised (in shares)	(174,453)
Forfeited (in shares)	(720,463)
Ending balance (in shares)	48,585,594
Weighted Average Exercise Price
Beginning balance (in USD per share)	$ 10.33
Granted (in USD per share)
Exercised (in USD per share)
Forfeited (in USD per share)
Ending balance (in USD per share)	$ 10.40
Additional Information
Weighted Average Remaining Contractual Term	6 years 4 months 24 days	6 years 7 months 6 days
Weighted Average Intrinsic Value	$ 98,745		$ 276,959
Options exercisable	32,514,889
Option exercisable - Weighted Average Exercise Price (in USD per share)	$ 8.44
Option exercisable - Weighted Average Remaining Contractual Term	5 years 3 months 18 days
Options exercisable - Weighted Average Intrinsic Value	$ 98,745
Options vested and expected to vest	45,915,517
Options vested and expected to vest - Weighted Average Exercise Price (in USD per share)	$ 10.16
Options vested and expected to vest - Weighted Average Remaining Contractual Term	6 years 3 months 18 days
Options vested and expected to vest - Weighted Average Intrinsic Value	$ 98,745

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