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Stock Compensation Plans (Tables)
 12 Months Ended
Jan. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award
The following table summarizes our PSU activity during fiscal 2023: 

 Shares
(in thousands)		Weighted-Average Grant-Date Fair Value Per Share
Outstanding as of January 31, 2022
618 $185.67 
PSUs granted720 $180.68 
PSUs vested(493)$157.50 
PSUs forfeited and canceled(459)$201.15 
Outstanding as of January 31, 2023
386 $193.96 
The following table summarizes our RSU activity during fiscal 2023: 

 Shares
(in thousands)		Weighted-Average Grant-Date Fair Value Per Share
Outstanding as of January 31, 2022
11,069 $145.51 
RSUs granted8,045 $115.96 
RSUs vested(4,793)$141.57 
RSUs forfeited and canceled(2,694)$139.35 
Outstanding as of January 31, 2023
11,627 $128.11 
The following table summarizes our RSA activity during fiscal 2023: 

 Shares
(in thousands)		Weighted-Average Grant-Date Fair Value Per Share
Outstanding as of January 31, 2022
246 $128.79 
RSAs issued in connection with acquisition233 $72.03 
RSAs vested(187)$123.10 
RSAs forfeited and canceled(3)$191.16 
Outstanding as of January 31, 2023
289 $86.15 
The following table summarizes our stock option activity during fiscal 2023:

 Shares
(in thousands)		Weighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Term
(in years)
Aggregate Intrinsic Value (1)
(in thousands)
Outstanding as of January 31, 2022
213 $12.35 5.8$23,767 
Options exercised(98)$14.50 
Options forfeited and expired(7)$14.64 
Outstanding as of January 31, 2023
108 $10.27 5.3$9,276 
Vested and expected to vest108 $10.26 5.3$9,232 
Exercisable as of January 31, 2023
98 $10.07 5.3$8,411 
_________________________
(1)    The intrinsic value is calculated as the difference between the exercise price of the underlying stock option award and the closing market price of our common stock as of January 31, 2023.
Schedule of Unrecognized Compensation Costs
The following table presents unrecognized compensation cost and the related weighted-average recognition period for RSUs, PSUs, RSAs, and stock options as of January 31, 2023:
 
Unrecognized Compensation Cost
(in thousands)		Weighted-Average Recognition Period
(in years)
RSUs$1,165,005 2.1
PSUs36,169 1.0
RSAs19,853 2.4
Stock options965 1.6
Total unrecognized compensation cost$1,221,992 
Share-Based Payment Arrangement, Activity
The following table summarizes fiscal 2023 activity impacting the number of shares available for grant:

(In thousands)Shares Available
for Grant
Balance as of January 31, 2022
21,744 
Additional shares authorized15,445 
Options forfeited and expired4 
RSUs and PSUs granted(8,765)
RSUs and PSUs forfeited and canceled500 
Shares withheld related to net share settlement of RSUs and PSUs347 
Canceled upon effectiveness of the 2022 Plan(19,359)
Balance as of January 31, 2023
9,916 
Schedule of allocation of stock-based compensation expense related to stock-based awards and employee stock purchases
Stock-based compensation expense related to our stock-based awards and ESPP was allocated as follows:
Fiscal Year Ended January 31,
(In thousands)202320222021
Cost of revenues$86,247 $79,968 $56,437 
Research and development339,624 327,065 271,120 
Sales and marketing247,505 246,447 198,346 
General and administrative115,762 141,338 92,752 
Total stock-based compensation expense$789,138 $794,818 $618,655 
Schedule of assumptions used to determine fair value of PSUs The following table summarizes the assumptions used in the Monte Carlo simulation model to determine the fair value of PSUs granted during fiscal 2023, 2022 and 2021:
Fiscal Year Ended January 31,
202320222021
Expected volatility (1)
45.4 - 48.1%
46.0 - 47.5%
42.8 - 43.9%
Risk-free rate
1.8 - 3.9%
0.3 - 0.4%
0.2 - 0.6%
Dividend yield— — — 
Expected term (in years)
2.4 - 3.0
2.7 - 3.0
3.4 - 4.0
_________________________
(1)    Equal weighting of Splunk historical and implied volatility.
The following table summarizes the assumptions used in the Black-Scholes method to determine the fair value of options granted during fiscal 2022 and 2021:
Fiscal Year Ended January 31,
20222021
Expected volatility
43.1 - 45.7%
43.8 - 44.1%
Risk-free rate
0.3 - 1.0%
0.4 - 0.5%
Dividend yield— — 
Expected term (in years)
3.2 - 5.7
4.7 - 5.5
Schedule of assumptions used to estimate the fair value of the ESPP
The following table summarizes the assumptions used in the Black-Scholes option-pricing model to determine the fair value of our common shares under the ESPP:
Fiscal Year Ended January 31,
202320222021
Expected volatility
54.0 - 65.9%
40.6 - 47.4%
53.2 - 70.2%
Risk-free rate
2.3 - 4.7%
0.1 - 0.3%
0.1 - 0.2%
Dividend yield— — — 
Expected term (in years)
0.5 - 2.0
0.5 - 1.0
0.5 - 1.0