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Equity Incentive Plans
 6 Months Ended
Oct. 31, 2020
Share-based Payment Arrangement [Abstract]  
Equity Incentive Plans Equity Incentive Plans
In September 2012, the Company’s board of directors adopted and the Company’s shareholders approved the 2012 Stock Option Plan, which was amended and restated in September 2018 (as amended and restated, the “2012 Plan”). Under the 2012 Plan, the board of directors and the compensation committee, as administrator of the 2012 Plan, may grant stock options and other equity-based awards, such as Restricted Stock Awards (“RSAs”) or Restricted Stock Units (“RSUs”), to eligible employees, directors, and consultants to attract and retain the best available personnel for positions of substantial responsibility, to provide additional incentive to employees, directors and consultants, and to promote the success of the Company’s business. The Company’s board of directors or compensation committee determines the vesting schedule for all equity-based awards. Stock options granted to new employees under the 2012 Plan generally vest over four years with 25% of the option shares vesting one year from the vesting commencement date and then ratably over the following 36 months subject to the employees continued service to the Company. Refresh grants to existing employees generally vest monthly over four years subject to the employees continued service to the Company. RSUs granted to new employees generally vest over a period of four years with 25% vesting on the one-year anniversary of the vesting start date and the remainder vesting semi-annually over the next three years, subject to the grantee’s continued service to the Company. RSUs granted to existing employees generally vest semi-annually over a period of four years, subject to the grantee’s continued service to the Company. The Company’s compensation committee may explicitly deviate from the general vesting schedules in its approval of an equity-based award, as it may deem appropriate. Stock options expire ten years after the date of grant. Stock options, RSAs and RSUs that are canceled under certain conditions become available for future grant or sale under the 2012 Plan unless the 2012 Plan is terminated.
The equity awards available for grant for the periods presented were as follows:
 Six Months Ended
October 31, 2020
Available at beginning of period12,461,850 
Awards authorized4,142,849 
Stock options granted(40,129)
Stock options cancelled506,718 
RSUs granted(668,605)
RSUs cancelled210,123 
Available at end of period16,612,806 
Endgame Stock Incentive Plan Assumed in Acquisition
In connection with its acquisition of Endgame, the Company assumed all in-the-money stock options issued under Endgame’s Amended and Restated 2010 Stock Incentive Plan that were outstanding on the date of acquisition. The assumed stock options will continue to be outstanding and will be governed by the provisions of their respective plan and are included in the stock option activity table below.
Stock Options
The following table summarizes stock option activity (in thousands, except share and per share data):
 Stock options Outstanding
 Number of
Stock Options
Outstanding		Weighted-
Average
Exercise
Price		Remaining
Contractual
Term
(in years)		Aggregate
Intrinsic
Value
Balance as of April 30, 202015,260,506 $14.17 7.27$767,795 
Stock options granted40,129 $99.78 
Stock options exercised(4,035,115)$11.25 
Stock options cancelled(506,718)$19.19 
Stock options assumed in acquisition cancelled(899)$75.00 
Balance as of October 31, 202010,757,903 $15.33 6.93$925,989 
Exercisable as of October 31, 20205,926,542 $12.36 6.56$527,662 
 
Stock options exercisable include 238,994 stock options that were unvested as of October 31, 2020.
Aggregate intrinsic value represents the difference between the exercise price of the stock options to purchase ordinary shares and the fair value of the Company’s ordinary shares. The weighted-average grant-date fair value of stock options granted was $56.37 for the three and six months ended October 31, 2020. The weighted-average grant-date fair value of stock options granted was $54.20 and $50.92 for the three and six months ended October 31, 2019, respectively.
As of October 31, 2020, the Company had unrecognized stock-based compensation expense of $38.9 million related to unvested stock options that the Company expects to recognize over a weighted-average period of 1.79 years.
RSUs
During the six months ended October 31, 2020, the Company granted 668,605 RSUs at a weighted-average grant date fair value of $88.20 per unit.
During the three and six months ended October 31, 2020, the Company cancelled 80,839 cash settled RSUs and contemporaneously granted 80,839 equity settled RSUs. The modification of the awards and related change in the classification of awards from liability-classified to equity-classified was accounted under the provisions of ASC 718 - Stock Compensation. Prior to the conversion, the Company performed a final measurement of its stock-based compensation liability under the fair value method, which resulted in a non-cash stock based compensation expense of $2.5 million. Additionally, upon modification of the awards, the Company reclassified $2.7 million stock-based compensation liability to additional-paid in capital.
As of October 31, 2020, the Company had unrecognized stock-based compensation expense of $165.7 million related to equity settled RSUs that the Company expects to recognize over a weighted-average period of 3.12 years.
The following table summarizes RSU activity for the 2012 Plan:
 Number of
Awards		Weighted-
Average
Grant Date
Fair Value
Outstanding and unvested at April 30, 20202,472,092 $66.78 
RSUs granted668,605 $88.20 
RSUs released(312,898)$76.33 
RSUs cancelled(210,123)$52.15 
Outstanding and unvested at October 31, 20202,617,676 $72.28 
Stock-Based Compensation Expense
Total stock-based compensation expense recognized in the Company’s condensed consolidated statements of operations was as follows (in thousands):
 Three Months Ended October 31,Six Months Ended October 31,
 2020201920202019
Cost of revenue—cost of subscription—self-managed and SaaS$1,860 $946 $3,226 $1,861 
Cost of revenue—professional services976 638 1,928 1,199 
Research and development7,663 5,870 14,793 10,831 
Sales and marketing7,955 4,658 14,147 8,966 
General and administrative3,033 2,304 5,984 4,330 
Total stock-based compensation expense$21,487 $14,416 $40,078 $27,187