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Stock-Based Compensation (Tables)
 12 Months Ended
Oct. 03, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity
The summary of the Company’s stock option activity is as follows:




Number of
Options		Weighted-Average Exercise PriceWeighted-Average Remaining Contractual TermAggregate Intrinsic Value
(in years)(in thousands)
Outstanding at September 28, 201937,155,568 $11.39 6.3$94,288 
Exercised (5,985,471)7.06
Forfeited (2,747,157)14.16
Outstanding at October 3, 202028,422,940 $12.03 5.6$99,053 
At October 3, 2020
Options exercisable 24,230,278 $11.60 5.2$94,768 
Options vested and expected to vest 27,877,806 $11.98 5.6$98,495 
Schedule of fair value of options The fair value of options at the date of grant was estimated with the following weighted-average assumptions:
September 28,
2019		September 29,
2018
Expected term (years)6.516.25
Risk-free interest rate2.67 %2.73 %
Expected volatility30.7 %30.19 %
Expected dividend yield— %— %
Schedule of restricted stock unit activity The summary of the Company’s unvested RSU activity is as follows:



Number of
Units		Weighted-Average Grant Date Fair ValueAggregate Intrinsic Value
(in thousands)
Outstanding at September 28, 20196,716,786 $11.40 $90,744 
Granted 9,030,809 
Exercised (2,406,900)
Forfeited (1,692,744)
Expired
— 
Outstanding at October 3, 202011,647,951 $10.50 $180,543 
At October 3, 2020
Units expected to vest 9,530,614 $10.53 $147,725 
Schedule of stock-based compensation expense
Total stock-based compensation expense by function category was as follows:
October 3,
2020		September 28,
2019		September 29,
2018
(In thousands)
Cost of revenue$1,106 $985 $198 
Research and development23,439 17,643 13,960 
Sales and marketing14,359 12,965 15,885 
General and administrative18,706 14,982 8,602 
Total stock-based compensation expense$57,610 $46,575 $38,645