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Stockholders' Equity (Tables)
12 Months Ended
Jan. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of each stock option grant was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions and fair value per share:
 Fiscal Year Ended January 31,
Stock Options202120202019
Volatility
28 - 37
%
27 - 30
%
27 - 28
%
Estimated life3.5 years3.5 years3.5 years
Risk-free interest rate
0.2 - 1.4
%
1.6 - 2.5
%
2.5 - 3.0
%
Weighted-average fair value per share of grants$41.24 $39.59 $28.89 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
 Fiscal Year Ended January 31,
ESPP202120202019
Volatility
42 - 48
%
28 - 33
%
23 - 26
%
Estimated life0.75 years0.75 years0.75 years
Risk-free interest rate
0.1 - 0.2
%
1.6 - 2.1
%
2.0 - 2.6
%
Weighted-average fair value per share of grants$64.14 $41.43 $32.90 
Share-based Compensation, Stock Options, Activity
Stock option activity, excluding the ESPP for fiscal 2021 is as follows:
  Options Outstanding
 Shares
Available for
Grant
(in millions)
Outstanding
Stock
Options
(in millions)
Weighted-
Average
Exercise Price
Aggregate
Intrinsic Value (in millions)
Balance as of January 31, 202077 27 $98.56 
Increase in shares authorized:
2013 Equity Incentive Plan31 
Assumed equity plans
Options granted under all plans(8)147.80 
Restricted stock activity(19)
Performance-based restricted stock units(2)
Exercised(10)79.12 
Plan shares expired or canceled(2)136.34 
Balance as of January 31, 202182 23 $120.61 $2,455 
Vested or expected to vest22 $118.53 $2,341 
Exercisable as of January 31, 202110 $87.40 $1,440 
Schedule of Stock Options Outstanding
The following table summarizes information about stock options outstanding as of January 31, 2021:
 Options OutstandingOptions Exercisable
Range of Exercise
Prices
Number
Outstanding
(in millions)
Weighted-
Average
Remaining
Contractual Life
(Years)
Weighted-
Average
Exercise
Price
Number of
Shares
(in millions)
Weighted-
Average
Exercise
Price
$0.36 to $59.34
3.0$41.41 $42.90 
$59.64 to $118.04
3.497.24 92.64 
$122.03 to $148.95
5.3142.49 137.73 
$154.14
6.2154.14 0.00 
$155.20 to $161.50
5.0161.50 161.50 
$162.81 to $258.04
6.1202.46 0.00 
23 4.6$120.61 10 $87.40 
Schedule of Restricted Stock Activity
Restricted stock activity for fiscal 2021 is as follows:
 Restricted Stock Outstanding
 Outstanding
(in millions)
Weighted-Average Grant Date Fair ValueAggregate
Intrinsic
Value (in millions)
Balance as of January 31, 202028 $140.14 
Granted - restricted stock units and awards11 165.52 
Granted - performance-based stock units154.14 
Canceled(2)144.54 
Vested and converted to shares(13)132.43 
Balance as of January 31, 202125 $155.50 $5,727 
Expected to vest22 $5,058 
Share-based Payment Arrangement, Expensed and Capitalized, Amount
The aggregate expected stock compensation remaining to be recognized as of January 31, 2021 is as follows (in millions):
Fiscal Period:
Fiscal 2022$1,923 
Fiscal 20231,273 
Fiscal 2024725 
Fiscal 2025157 
Total stock compensation$4,078 
Schedule of Shares Of Common Stock Available For Future Issuance Under Stock Option Plans
The following number of shares of common stock were reserved and available for future issuance at January 31, 2021 (in millions):
Options outstanding23 
Restricted stock awards and units and performance-based stock units outstanding25 
Stock available for future grant or issuance:
2013 Equity Incentive Plan80 
2014 Inducement Plan
Amended and Restated 2004 Employee Stock Purchase Plan
137