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Stockholders' Equity (Tables)
12 Months Ended
Jan. 31, 2020
Equity [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 Options202020192018
Volatility
27 - 30
%
27 - 28
%
28 - 31
%
Estimated life3.5 years3.5 years3.5 years
Risk-free interest rate
1.6 - 2.5
%
2.5 - 3.0
%
1.4 - 2.3
%
Weighted-average fair value per share of grants$39.59  $28.89  $22.71  
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
 Fiscal Year Ended January 31,
ESPP202020192018
Volatility
28 - 33
%
23 - 26
 
21 - 28
%
Estimated life0.75 years0.75 years0.75 years
Risk-free interest rate
1.6 - 2.1
%
2.0 - 2.6
%
1.1 - 1.7
%
Weighted-average fair value per share of grants$41.43  $32.90  $23.64  
Share-based Compensation, Stock Options, Activity
Stock option activity, excluding the ESPP 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, 201964  26  $74.15  
Increase in shares authorized:
2013 Equity Incentive Plan36   0.00  
2014 Inducement Plan  0.00  
Assumed equity plans13   0.00  
Options granted under all plans(10) 10  132.72  
Restricted stock activity(28)  0.00  
Performance-based restricted stock units(2)  0.00  
Exercised (7) 55.67  
Plan shares expired or canceled (2) 116.84  
Balance as of January 31, 202077  27  $98.56  $2,222  
Vested or expected to vest25  $95.80  $2,155  
Exercisable as of January 31, 202014  $66.34  $1,589  
Share-based Payment Arrangement, Expensed and Capitalized, Amount
The aggregate stock compensation remaining to be recognized as of January 31, 2020 is as follows (in millions):
Fiscal Period:
Fiscal 2021$1,787  
Fiscal 20221,254  
Fiscal 2023778  
Fiscal 2024197  
Total stock compensation$4,016  
Schedule Of Stock Options Outstanding
The following table summarizes information about stock options outstanding as of January 31, 2020:
 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 $52.30
 3.7$29.10   $30.55  
$54.36 to $75.57
 3.067.41   66.08  
$76.48 to $113.00
 3.483.71   82.59  
$118.04   5.1118.04   118.04  
$122.03 to $158.76
 6.3145.38   133.49  
$161.50   6.1161.50   0.00  
27  4.5$98.56  14  $66.34  
Schedule Of Restricted Stock Activity
Restricted stock activity is as follows:
 Restricted Stock Outstanding
 Outstanding
(in millions)
Weighted-Average Grant Date Fair ValueAggregate
Intrinsic
Value (in millions)
Balance as of January 31, 201921  $103.33  
Granted - restricted stock units and awards20  156.21  
Granted - performance-based stock units 161.50  
Canceled(2) 120.93  
Vested and converted to shares(12) 106.39  
Balance as of January 31, 202028  $140.14  $5,128  
Expected to vest24  $4,452  
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, 2020 (in millions):
Options outstanding27  
Restricted stock awards and units and performance-based stock units outstanding28  
Stock available for future grant or issuance:
2013 Equity Incentive Plan74  
2014 Inducement Plan 
Acquired equity plans 
Amended and Restated 2004 Employee Stock Purchase Plan 
133