Consolidated Statements of Redeemable Convertible Preference Shares and Shareholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Ordinary Shares	Treasury Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Endgame	Endgame Ordinary Shares	Endgame Additional Paid-In Capital	LambdaLab Ordinary Shares	Swiftype	Swiftype Ordinary Shares	Swiftype Additional Paid-In Capital	Opbeat	Opbeat Ordinary Shares	Opbeat Additional Paid-In Capital	Prelert Ordinary Shares	Redeemable Convertible Preference Shares
Temporary equity, beginning balance (in shares) at Apr. 30, 2017																		28,939,466
Temporary equity, beginning balance at Apr. 30, 2017																		$ 200,921
Temporary equity, ending balance (in shares) at Apr. 30, 2018																		28,939,466
Temporary equity, ending balance at Apr. 30, 2018																		$ 200,921
Beginning balance (in shares) at Apr. 30, 2017		31,130,047
Beginning balance at Apr. 30, 2017	$ (128,538)	$ 31	$ (25)	$ 35,395	$ (1,892)	$ (162,047)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of ordinary shares upon exercise of stock options (in shares)		668,518
Issuance of ordinary shares related to early exercised stock options	2,337	$ 1		2,336
Ordinary shares issued in connection with the acquisition (in shares)												732,274			488,998		98,425
Ordinary shares issued in connection with the acquisition											$ 8,392	$ 1	$ 8,391	$ 4,018		$ 4,018
Stock-based compensation	12,293			12,293
Net loss	(52,727)					(52,727)
Foreign currency translation	931				931
Vesting of early exercised stock options	109			109
Issuance of ordinary shares related to early exercise of stock options (in shares)		148,630
Repurchase of ordinary shares (in shares)		(33,937)
Repurchase of ordinary shares	(344)		(344)
Ending balance (in shares) at Apr. 30, 2018		33,232,955
Ending balance at Apr. 30, 2018	(153,529)	$ 33	(369)	62,542	(961)	(214,774)
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering (in shares)																		(28,939,466)
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering																		$ (200,921)
Temporary equity, ending balance (in shares) at Apr. 30, 2019																		0
Temporary equity, ending balance at Apr. 30, 2019																		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of ordinary shares upon exercise of stock options (in shares)		3,117,320
Issuance of ordinary shares related to early exercised stock options	18,552	$ 33		18,519
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering (in shares)		28,939,466
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering	200,921	$ 289		200,632
Ordinary shares issued in connection with the acquisition (in shares)										134,474
Vesting of ordinary shares subject to repurchase	449			449
Stock-based compensation	34,531			34,531
Net loss	(102,303)					(102,303)
Foreign currency translation	(470)				(470)
Change in par value upon conversion from B.V. to N.V.		$ 303		(303)
Issuance of ordinary shares upon initial public offering, net of underwriting discounts and issuance costs (in shares)		8,050,000
Issuance of ordinary shares upon initial public offering, net of underwriting discounts and issuance costs	263,842	$ 93		263,749
Issuance of ordinary shares upon subscription of restricted stock (in shares)		244,498
Issuance of ordinary shares upon subscription of restricted stock awards		$ 3		(3)
Vesting of early exercised stock options	$ 1,019			1,019
Repurchase of early exercised stock options (in shares)	(43,630)
Ending balance (in shares) at Apr. 30, 2019		73,675,083
Ending balance at Apr. 30, 2019	$ 263,012	$ 754	(369)	581,135	(1,431)	(317,077)
Temporary equity, ending balance (in shares) at Apr. 30, 2020																		0
Temporary equity, ending balance at Apr. 30, 2020																		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of ordinary shares upon exercise of stock options (in shares)		6,815,098
Issuance of ordinary shares related to early exercised stock options	61,463	$ 77		61,386
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering (in shares)		152,688
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering	2	$ 2
Ordinary shares issued in connection with the acquisition (in shares)								1,983,663
Ordinary shares issued in connection with the acquisition							$ 167,337	$ 21	$ 167,316
Ordinary shares issued in connection with the acquisition of Endgame held in escrow (in shares)		235,031
Ordinary shares issued in connection with the acquisition of Endgame held in escrow							19,826	$ 2	19,824
Assumption of stock option plan as consideration for acquisition of Endgame							$ 9,309		$ 9,309
Repurchase of unvested RSAs (in shares)		(4,585)
Vesting of ordinary shares subject to repurchase	2,730			2,730
Stock-based compensation	57,088			57,088
Net loss	(167,174)					(167,174)
Foreign currency translation	54				54
Ending balance (in shares) at Apr. 30, 2020		82,856,978
Ending balance at Apr. 30, 2020	$ 413,647	$ 856	$ (369)	$ 898,788	$ (1,377)	$ (484,251)