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Stock-based Compensation
 6 Months Ended
Mar. 29, 2025
Share-Based Payment Arrangement [Abstract]  
Stock-based compensation
9. Stock-based Compensation
2018 Equity Incentive Plan
In July 2018, the Board adopted the 2018 Equity Incentive Plan (the "2018 Plan").
Stock options
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, 20247,082,389$14.24 2.8$210 
Exercised(195,479)$13.59  
Forfeited / expired(235,600)$14.61  
Outstanding at March 29, 20256,651,310$14.24 1.8$— 
As of March 29, 2025 and September 28, 2024, all outstanding stock options have vested and the Company had no unrecognized stock-based compensation expense related to stock options.
Restricted stock units ("RSU")
Pursuant to the 2018 Plan, the Company issues RSUs to employees and directors. The summary of the Company’s RSU activity is as follows:
Number of Units
Weighted-Average Grant Date Fair
Value		Aggregate Intrinsic Value
(In thousands)
Outstanding at September 28, 202410,763,098$14.79 $130,772 
Granted7,089,087$12.45  
Released(3,474,904)$15.09  
Forfeited(2,808,466)$13.81  
Outstanding at March 29, 202511,568,815$13.51 $124,712 
As of March 29, 2025 and September 28, 2024, the Company had $115.6 million and $115.4 million of unrecognized stock-based compensation expense related to RSUs, which are expected to be recognized over weighted-average periods of 2.4 years.
Performance stock units ("PSU")
Pursuant to the 2018 Plan, the Company has issued and may issue certain PSUs that vest on the satisfaction of service and performance conditions. The number of outstanding PSUs is based on the target number of share awards. The number of shares vested at the end of the performance period is based on achievement of performance conditions and includes a performance adjustment to reflect the extent to which the corresponding performance goals have been achieved. The summary of the Company’s PSU activity is as follows:
Number of Units
Weighted-Average Grant Date Fair
Value		Aggregate Intrinsic Value
(In thousands)
Outstanding at September 28, 2024684,080$18.37 $8,312 
Granted326,375$11.55 
Released(7,194)$17.54 
Performance adjustment
(121,250)$21.80 
Forfeited(79,517)$17.42 
Outstanding at March 29, 2025802,494$15.18 $8,651 
As of March 29, 2025 and September 28, 2024, the Company had $3.8 million and $0.2 million of unrecognized stock-based compensation expense related to PSUs, which are expected to be recognized over weighted-average periods of 1.5 years.
Stock-based compensation
Total stock-based compensation expense by functional category was as follows:
Three Months EndedSix Months Ended
March 29,
2025		March 30,
2024		March 29,
2025		March 30,
2024
(In thousands)
Cost of revenue$1,606 $686 $2,955 $1,340 
Research and development8,557 10,419 21,872 19,398 
Sales and marketing4,027 4,972 9,659 8,787 
General and administrative9,055 7,596 14,093 13,506 
Total stock-based compensation expense$23,245 $23,673 $48,579 $43,031