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Stockholders' Equity and Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense in Consolidated Statement of Operations
The following presents stock-based compensation expense in the Company’s Consolidated Statements of Operations in fiscal 2023, 2022 and 2021:
202320222021
Cost of revenues$10.5 $9.1 $8.0 
Research and development10.5 8.8 7.7 
Selling and marketing12.0 10.5 9.5 
General and administrative46.6 38.3 38.9 
Restructuring— — 0.9 
$79.6 $66.7 $65.0 
Information Pertaining to Stock Options Granted and Related Assumptions Information pertaining to stock options granted during fiscal 2023, 2022 and 2021 and related assumptions are noted in the following table:
 Years ended
September 30, 2023September 24, 2022September 25, 2021
Options granted (in millions)0.5 0.7 0.6 
Weighted-average exercise price$74.66 $71.07 $68.62 
Weighted-average grant date fair value$25.95 $21.01 $19.86 
Assumptions:
Risk-free interest rates4.3 %1.1 %0.4 %
Expected life (in years)4.84.84.8
Expected volatility33.9 %34.2 %35.0 %
Dividend yield— — — 
Stock Option Activity
The following table summarizes all stock option activity under the Company’s stock option plans for the year ended September 30, 2023:
 
Number
of Shares
(in millions)		Weighted-
Average
Exercise Price		Weighted-
Average
Remaining
Contractual Life
(in Years)		Aggregate
Intrinsic
Value
(in millions)
Options outstanding at September 24, 20224.4 $48.46 6.1$71.0 
Granted0.5 74.66 
Canceled/ forfeited(0.2)67.33 
Exercised(0.5)42.59 18.4 
Options outstanding at September 30, 20234.2 $51.63 5.6$77.6 
Options exercisable at September 30, 20233.0 $44.49 4.6$73.8 
Options vested and expected to vest at September 30, 2023 (1)4.2 $51.56 5.6$77.6 
 
(1)This represents the number of vested stock options as of September 30, 2023 plus the unvested outstanding options at September 30, 2023 expected to vest in the future, adjusted for estimated forfeitures.
Restricted Stock Unit Activity
A summary of the Company’s RSU, PSU, FCF and MSU activity during the year ended September 30, 2023 is presented below:
Non-vested SharesNumber of
Shares
(in millions)		Weighted-Average
Grant-Date Fair
Value
Non-vested at September 24, 20221.7 $64.43 
Granted1.0 75.73 
Vested(0.9)55.40 
Forfeited(0.2)72.11 
Non-vested at September 30, 20231.6 $73.33 
Black-Scholes Model Weighted Average Assumptions Used to Estimate Fair Value of Shares to Be Issued as of Grant Date The Company uses the Black-Scholes model to estimate the fair value of shares to be issued as of the grant date using the following weighted average assumptions:
September 30, 2023September 24, 2022September 25, 2021
Assumptions:
Risk-free interest rates4.10 %0.96 %0.26 %
Expected life (in years)0.50.50.5
Expected volatility34.0 %34.0 %34.1 %
Dividend yield— — —