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Stock-based compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Mar. 28, 2020
USD ($)
$ / shares
shares
Sep. 28, 2019
USD ($)
$ / shares
shares
Number of Options    
Beginning balance (in shares) | shares 37,155,568  
Granted (in shares) | shares 0  
Exercised (in shares) | shares (2,186,674)  
Forfeited (in shares) | shares (892,262)  
Ending balance (in shares) | shares 34,076,632 37,155,568
Options exercisable (in shares) | shares 26,650,301  
Options vested and expected to vest (in shares) | shares 33,117,267  
Weighted Average Exercise Price    
Beginning balance (in USD per share) | $ / shares $ 11.39  
Granted (in USD per share) | $ / shares  
Exercised (in USD per share) | $ / shares  
Forfeited (in USD per share) | $ / shares  
Ending balance (in USD per share) | $ / shares 11.67 $ 11.39
Option exercisable - Weighted Average Exercise Price (in USD per share) | $ / shares 10.94  
Options vested and expected to vest - Weighted Average Exercise Price (in USD per share) | $ / shares $ 11.59  
Additional Information    
Weighted Average Remaining Contractual Term 5 years 10 months 24 days 6 years 3 months 18 days
Option exercisable - Weighted Average Remaining Contractual Term 5 years 4 months 24 days  
Options vested and expected to vest - Weighted Average Remaining Contractual Term 5 years 10 months 24 days  
Aggregate Intrinsic Value | $ $ 34,439 $ 94,288
Options exercisable - Weighted Average Intrinsic Value | $ 34,439  
Options vested and expected to vest - Weighted Average Intrinsic Value | $ $ 34,439