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Stock-Based Compensation (Tables)
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Schedule of assumptions used in the Black-Scholes valuation model
The estimated assumptions used in the Black-Scholes valuation model to value our ESPP purchase rights were as follows:

ESPP Purchase Rights
 Three Months Ended
September 30,
20212020
Risk-free interest rate
0.1%
0.1%
Expected volatility
25 - 28%
34 - 39%
Weighted-average volatility
27%
37%
Expected term
6 - 12 months
6 - 12 months
Expected dividends
0.6%
None
  
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   The following table summarizes stock-based compensation expense resulting from stock options, restricted stock units, market-based restricted stock units, performance-based restricted stock units, and the ESPP purchase rights included in our Condensed Consolidated Statements of Operations (in millions):
 Three Months Ended
September 30,		Six Months Ended
September 30,
 2021202020212020
Cost of revenue$2 $2 $3 $3 
Research and development101 74 186 140 
Marketing and sales15 12 27 23 
General and administrative31 25 58 49 
Stock-based compensation expense$149 $113 $274 $215 
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   The following table summarizes our stock option activity for the six months ended September 30, 2021:
Options
(in thousands)		Weighted-
Average
Exercise Prices		Weighted-
Average
Remaining
Contractual
Term  (in years)		Aggregate
Intrinsic Value
(in millions)
Outstanding as of March 31, 2021
267 $35.71 
Assumed via acquisition150 60.87 
Granted2 142.78 
Exercised(34)46.29 
Forfeited, cancelled or expired(35)66.29 
Outstanding as of September 30, 2021
350 $42.86 3.18$35 
Vested and expected to vest350 $42.86 3.18$35 
Exercisable as of September 30, 2021
309 $40.24 2.70$32 
Restricted Stock Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   The following table summarizes our restricted stock unit activity for the six months ended September 30, 2021:
Restricted
Stock Rights
(in thousands)		Weighted-
Average Grant
Date Fair Values
Outstanding as of March 31, 20215,764 $113.25 
Assumed via acquisition816 120.54 
Granted3,486 142.04 
Vested(1,860)117.02 
Forfeited or cancelled(552)121.42 
Outstanding as of September 30, 20217,654 $125.63 
Performance Based Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   The following table summarizes our performance-based restricted stock unit activity, presented with the maximum number of shares that could potentially vest, for the six months ended September 30, 2021:
Performance-
Based Restricted
Stock Units
(in thousands)		Weighted-
Average Grant
Date Fair Value
Outstanding as of March 31, 2021579 $110.51 
Granted219 142.60 
Vested(266)110.51 
Forfeited or cancelled(317)110.98 
Outstanding as of September 30, 2021215 $142.60 
Market-Based Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   The following table summarizes our market-based restricted stock unit activity, presented with the maximum number of shares that could potentially vest, for the six months ended September 30, 2021:
Market-Based
Restricted  Stock
Units
(in thousands)		Weighted-
Average  Grant
Date Fair Value
Outstanding as of March 31, 20212,195 $134.60 
Granted159 173.25 
Vested(176)128.62 
Forfeited or cancelled(614)153.69 
Outstanding as of September 30, 20211,564 $131.71 
Repurchase Program, Total [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   The following table summarizes total shares repurchased during the three and six months ended September 30, 2021 and 2020:
May 2018 ProgramNovember 2020 ProgramTotal
(In millions)SharesAmountSharesAmountSharesAmount
Three months ended September 30, 2021
—$— 2.3$325 2.3$325 
Six months ended September 30, 2021
—$— 4.6$650 4.6$650 
Three months ended September 30, 2020
—$— — $— —$— 
Six months ended September 30, 2020
0.7 $78 — $— 0.7 $78