Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020
Summary Of Significant Accounting Policies [Line Items]
Decrease in accumulated deficit, from ASU 2016-13 adoption	$ (449,800)	$ (455,663)	$ (450,831)	$ (442,657)	$ (432,379)	$ (413,647)
Short-term deferred revenue, adjustment	354,148		352,805
Long-term deferred revenue, adjustment	(36,165)		(44,895)
Accumulated Deficit
Summary Of Significant Accounting Policies [Line Items]
Decrease in accumulated deficit, from ASU 2016-13 adoption	$ 694,830	$ 647,807	$ 613,318	$ 532,043	$ 502,885	484,251
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Decrease in accumulated deficit, from ASU 2016-13 adoption						(367)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
Summary Of Significant Accounting Policies [Line Items]
Decrease in accumulated deficit, from ASU 2016-13 adoption						$ (367)