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Stock-Based Compensation And Employee Benefit Plans (Tables)
 12 Months Ended
Mar. 31, 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
 Year Ended March 31,
 202120202019
Risk-free interest rate
0.1%
1.5 - 1.9%
2.2 - 2.5%
Expected volatility
32 - 39%
23 - 37%
29 - 33%
Weighted-average volatility
36%
26%
33%
Expected term
6 - 12 months
6 - 12 months
6 - 12 months
Expected dividends
0.3%
NoneNone
Schedule Of Assumptions Used In Monte-Carlo Simulation Model
The assumptions used in the Monte-Carlo simulation model to value our market-based restricted stock units were as follows:
 Year Ended March 31,
202120202019
Risk-free interest rate
0.2%
1.6 - 1.8%
2.6%
Expected volatility
23 - 63%
14 - 65%
16 - 47%
Weighted-average volatility
37%
29%
28%
Expected dividendsNoneNoneNone
Schedule Of Stock-Based Compensation Expense By Statement Of Operations
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 Consolidated Statements of Operations (in millions):
 Year Ended March 31,
 202120202019
Cost of revenue$5 $4 $4 
Research and development285 229 184 
Marketing and sales46 37 33 
General and administrative99 77 63 
Stock-based compensation expense$435 $347 $284 
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity
The following table summarizes our ESPP activity for fiscal years ended March 31, 2021, 2020 and 2019:
Shares Issued
(in millions)		Exercise Prices for Purchase RightsWeighted-Average Fair Values of Purchase Rights
Fiscal Year 2019
0.5 
$89.46 - $107.51
$31.88 
Fiscal Year 2020
0.7 
$74.70 - $74.89
$29.05 
Fiscal Year 2021
0.7 
$74.70 - $119.37
$29.80 
Shares Repurchased and Retired
The following table summarizes total shares repurchased during fiscal years 2021, 2020, and 2019:
May 2017 ProgramMay 2018 ProgramNovember 2020 ProgramTotal
(In millions)SharesAmountSharesAmountSharesAmountSharesAmount
Fiscal Year 2019
0.6 $76 10.4 $1,116 — $— 11.0 $1,192 
Fiscal Year 2020
— $— 12.3 $1,207 — $— 12.3 $1,207 
Fiscal Year 2021
— $— 0.7 $78 4.9 $651 5.6 $729 
Employee Stock 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 fiscal year ended March 31, 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, 2020
1,074 $30.85 
Granted3 127.35 
Exercised(810)29.60 
Forfeited, cancelled or expired— — 
Outstanding as of March 31, 2021
267 $35.71 3.22$27 
Vested and expected to vest267 $35.71 3.22$27 
Exercisable as of March 31, 2021
267 $35.71 3.22$27 
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
Each restricted stock unit granted reduces the number of shares available for grant by 1.43 shares under our 2019 Equity Plan. The following table summarizes our restricted stock units activity, excluding performance-based and market-based restricted stock unit activity which is discussed below, for the fiscal year ended March 31, 2021:
Restricted
Stock Units
(in thousands)		Weighted-
Average Grant
Date Fair Values
Outstanding as of March 31, 2020
6,217 $100.42 
Granted3,322 127.27 
Vested(3,285)103.68 
Forfeited or cancelled(490)109.64 
Outstanding as of March 31, 2021
5,764 $113.25 
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 fiscal year ended March 31, 2021:
Performance-
Based Restricted
Stock Units
(in thousands)		Weighted-
Average Grant
Date Fair Value
Outstanding as of March 31, 2020
579 $110.51 
Granted— — 
Forfeited or cancelled— — 
Outstanding as of March 31, 2021
579 $110.51 
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 year ended March 31, 2021:
Market-Based
Restricted  Stock
Units
(in thousands)		Weighted-
Average  Grant
Date Fair Value
Outstanding as of March 31, 2020
1,898 $128.41 
Granted874 145.78 
Vested(157)113.72 
Forfeited or cancelled(420)137.69 
Outstanding as of March 31, 2021
2,195 $134.60