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Stock-Based Compensation And Employee Benefit Plans (Tables)
12 Months Ended
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Assumptions Used In The Black-Scholes Valuation Model
 ESPP Purchase Rights
 Year Ended March 31,
 202020192018
Risk-free interest rate1.5 - 1.9%  2.2 - 2.5%  1.1 - 2.0%  
Expected volatility23 - 37%29 - 33%28 - 30%
Weighted-average volatility26 %33 %29 %
Expected term6 - 12 months6 - 12 months6 - 12 months
Expected dividendsNoneNoneNone
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,
202020192018
Risk-free interest rate1.6 - 1.8%  2.6 %1.5 - 1.6%  
Expected volatility14 - 65%  16 - 47%  17 - 46%  
Weighted-average volatility29 %28 %28 %
Expected dividendsNoneNone  None  
Schedule Of Stock-Based Compensation Expense By Statement Of Operations
 Year Ended March 31,
 202020192018
Cost of revenue$ $ $ 
Research and development229  184  146  
Marketing and sales37  33  32  
General and administrative77  63  61  
Stock-based compensation expense$347  $284  $242  
Summary Of Outstanding And Exercisable Stock Options
The following table summarizes outstanding and exercisable stock options as of March 31, 2020:
 Options Outstanding and Exercisable
Range of
Exercise Prices
Number
of Shares
(in thousands)
Weighted-
Average
Remaining
Contractual
Term  (in years)
Weighted-
Average
Exercise
Prices
Potential
Dilution
$11.53 - $22.42 1.81$16.80  — %
26.25 - 26.25550  3.5926.25  0.2 %
33.60 - 37.12517  4.2335.92  0.2 %
$11.53 - $37.121,074  3.89$30.85  0.4 %
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity
The following table summarizes our ESPP activity for fiscal years ended March 31, 2020, 2019 and 2018: 
Shares Issued
(in millions)
Exercise Prices for Purchase RightsWeighted-Average Fair Values of Purchase Rights
Fiscal Year 20180.6  $67.56 - $99.82  $21.57  
Fiscal Year 20190.5  $89.46 - $107.51  $31.88  
Fiscal Year 20200.7  $74.70 - $74.89  $29.05  
Shares Repurchased and Retired The following table summarizes total shares repurchased during fiscal years 2020, 2019, and 2018:
May 2015 ProgramMay 2017 ProgramMay 2018 ProgramTotal
(In millions)SharesAmountSharesAmountSharesAmountSharesAmount
Fiscal Year 20180.3  $31  5.0  $570  —  $—  5.3  $601  
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  
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, 2020: 
Options
(in thousands)
Weighted-
Average
Exercise Prices
Weighted-
Average
Remaining
Contractual
Term  (in years)
Aggregate
Intrinsic Value
(in millions)
Outstanding as of March 31, 20191,375  $30.63  
Granted 97.16  
Exercised(306) 30.96  
Forfeited, cancelled or expired—  —  
Outstanding as of March 31, 20201,074  $30.85  3.89$69  
Vested and expected to vest1,074  $30.85  3.89$69  
Exercisable as of March 31, 20201,074  $30.85  3.89$69  
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, 2020: 
Restricted
Stock Units
(in thousands)
Weighted-
Average Grant
Date Fair Values
Outstanding as of March 31, 20194,960  $111.03  
Granted4,297  93.52  
Vested(2,445) 108.42  
Forfeited or cancelled(595) 106.22  
Outstanding as of March 31, 20206,217  $100.42  
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
Performance-
Based Restricted
Stock Units
(in thousands)
Weighted-
Average Grant
Date Fair Value
Outstanding as of March 31, 2019579  $110.51  
Granted—  —  
Forfeited or cancelled—  —  
Outstanding as of March 31, 2020579  $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 :
Market-Based
Restricted  Stock
Units
(in thousands)
Weighted-
Average  Grant
Date Fair Value
Outstanding as of March 31, 2019958  $155.64  
Granted1,313  109.04  
Vested(93) 109.05  
Forfeited or cancelled(280) 137.08  
Outstanding as of March 31, 20201,898  $128.41