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Stock-Based Compensation (Tables)
 6 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Schedule Of Share-Based Payment Award, Restricted Stock Purchase Plan, Valuation Assumptions
The assumptions used in the Black-Scholes valuation model to estimate the value of our ESPP purchase rights were as follows:

 Three Months Ended
September 30,
20242023
Risk-free interest rate
4.5 - 5.0%
5.4 - 5.5%
Expected volatility
21 - 22%
23 - 24%
Weighted-average volatility21 %24 %
Expected term
6 - 12 months
6 - 12 months
Expected dividends0.6 %0.8 %
Schedule of Repurchase Agreements
The following table summarizes total shares repurchased during the three and six months ended September 30, 2024 and 2023:
August 2022 ProgramMay 2024 ProgramTotal
(In millions)Shares
Amount(a)
Shares
Amount(a)
SharesAmount
Three months ended September 30, 2024
— $— 2.6 $375 2.6 $375 
Six months ended September 30, 2024
1.2 $152 $4.2 $598 5.4 $750 
Three months ended September 30, 2023
2.6 $325 — $— 2.6 $325 
Six months ended September 30, 2023
5.2 $650 — $— 5.2 $650 
(a)Amount excludes excise taxes. Accrued excise taxes are included in accounts payable, accrued, and other current liabilities and additional paid-in capital on the Condensed Consolidated Balance Sheets.
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, 2024:
Options
(in thousands)		Weighted-
Average
Exercise Prices		Weighted-
Average
Remaining
Contractual
Term  (in years)		Aggregate
Intrinsic Value
(in millions)
Outstanding as of March 31, 2024
12 $64.00 
Granted2 137.55 
Exercised(4)88.68 
Forfeited, cancelled or expired(1)58.76 
Outstanding as of September 30, 2024
9 $65.81 3.88$1 
Vested and expected to vest9 $65.81 3.88$1 
Exercisable as of September 30, 2024
9 $65.81 3.88$1 
The following table summarizes our restricted stock units activity for the six months ended September 30, 2024:
Restricted
Stock Units
(in thousands)		Weighted-
Average Grant
Date Fair Values
Outstanding as of March 31, 20247,480 $128.31 
Granted4,173 137.78 
Vested(2,585)129.89 
Forfeited or cancelled(250)130.26 
Outstanding as of September 30, 20248,818 $132.28 
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, 2024:
Performance-
Based Restricted
Stock Units
(in thousands)		Weighted-
Average Grant
Date Fair Value
Outstanding as of March 31, 2024836 $129.60 
Granted763 137.53 
Vested(277)133.67 
Forfeited or cancelled(318)129.29 
Outstanding as of September 30, 20241,004 $134.60 
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, 2024:
Market-Based
Restricted  Stock
Units
(in thousands)		Weighted-
Average  Grant
Date Fair Value
Outstanding as of March 31, 2024354 $168.53 
Granted381 80.91 
Vested(25)173.25 
Forfeited or cancelled(73)173.25 
Outstanding as of September 30, 2024637 $115.43 
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,
 2024202320242023
Cost of revenue$4 $2 $8 $4 
Research and development122 113 223 206 
Marketing and sales16 13 28 24 
General and administrative32 27 58 51 
Stock-based compensation expense$174 $155 $317 $285