Equity Incentive Plans - Summary of RSU Activity (Details) - RSUs	6 Months Ended
	Oct. 31, 2020 $ / shares shares
Number of Awards
RSUs granted (in shares)	668,605
RSUs cancelled (in shares)	(210,123)
Weighted- Average Grant Date Fair Value
Weighted-average grant date fair value, RSUs granted (in dollars per share) | $ / shares	$ 88.20
2012 Plan
Number of Awards
Outstanding and unvested at April 30, 2020 (in shares)	2,472,092
RSUs granted (in shares)	668,605
RSUs released (in shares)	(312,898)
RSUs cancelled (in shares)	(210,123)
Outstanding and unvested at October 31, 2020 (in shares)	2,617,676
Weighted- Average Grant Date Fair Value
Weighted-average grant date fair value, outstanding and unvested at April 30, 2020 (in dollars per share) | $ / shares	$ 66.78
Weighted-average grant date fair value, RSUs granted (in dollars per share) | $ / shares	88.20
Weighted-average grant date fair value, RSUs released (in dollars per share) | $ / shares	76.33
Weighted-average grant date fair value, RSUs cancelled (in dollars per share) | $ / shares	52.15
Weighted-average grant date fair value, outstanding and unvested at October 31, 2020 (in dollars per share) | $ / shares	$ 72.28