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Stockholders' Equity (Tables)
 12 Months Ended
Jan. 31, 2022
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,
202220212020
Volatility
34 - 37
%
28 - 37
%
27 - 30
%
Estimated life3.5 years3.5 years3.5 years
Risk-free interest rate
0.4 - 1.7
%
0.2 - 1.4
%
1.6 - 2.5
%
Weighted-average fair value per share of grants$59.34 $41.24 $39.59 
Share-based Compensation, Stock Options, Activity Stock option activity, excluding the ESPP, for fiscal 2022 was 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, 202182 23 $120.61 
Increase in shares authorized:
2013 Equity Incentive Plan10 
Assumed equity plans7 
Options granted under all plans(8)8 201.38 
Restricted stock activity(26)
Performance-based restricted stock units activity(2)
Exercised(7)89.26 
Plan shares expired or canceled3 (3)163.48 
Balance as of January 31, 202266 21 $156.34 $3,078 
Vested or expected to vest20 $153.87 $2,934 
Exercisable as of January 31, 20229 $115.76 $1,709 
Schedule of Stock Options Outstanding The following table summarizes information about stock options outstanding as of January 31, 2022:
 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
$0.71 to $80.99
4 3.1$55.98 3 $57.00 
$81.88 to $148.24
3 3.7125.80 3 121.33 
$154.14
4 5.1154.14 2 154.14 
$155.20 to $207.53
3 4.2164.12 1 162.61 
$215.17 to $296.84
7 6.2223.61 0 0.00 
21 4.7156.34 9 $115.76 
Schedule of Restricted Stock Activity Restricted stock activity for fiscal 2022 was as follows:
 Restricted Stock Outstanding
 Outstanding
(in millions)		Weighted-Average Grant Date Fair ValueAggregate
Intrinsic
Value (in millions)
Balance as of January 31, 202125 $155.50 
Granted - restricted stock units and awards18 233.58 
Granted - performance-based stock units1 197.70 
Canceled(4)180.40 
Vested and converted to shares(13)160.45 
Balance as of January 31, 202227 $202.85 $6,350 
Expected to vest24 $5,618 
Share-based Payment Arrangement, Expensed and Capitalized, Amount The aggregate expected stock-based expense remaining to be recognized as of January 31, 2022 was as follows (in millions):
Fiscal Period:
Fiscal 2023$2,670 
Fiscal 20241,661 
Fiscal 20251,010 
Fiscal 2026239 
Total stock-based expense$5,580 
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, 2022 (in millions):
Options outstanding21 
Restricted stock awards and units and performance-based stock units outstanding27 
Stock available for future grant or issuance:
2013 Equity Incentive Plan66 
2014 Inducement Plan1 
Amended and Restated 2004 Employee Stock Purchase Plan4 
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