Acquisitions - Additional Information (Details)		1 Months Ended			12 Months Ended
	Oct. 08, 2019 USD ($) $ / shares shares	Jul. 31, 2018 USD ($) shares	Oct. 31, 2017 USD ($) shares	May 31, 2017 USD ($) shares	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	May 31, 2019 USD ($)	May 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill					$ 197,877,000	$ 19,846,000	$ 19,182,000
Stock-based compensation expense					$ 60,007,000	$ 39,942,000	12,742,000
Acquired identifiable intangible assets amortization period					3 years 10 months 24 days	2 years 6 months
General and administrative
Business Acquisition [Line Items]
Stock-based compensation expense					$ 9,925,000	$ 7,255,000	3,109,000
Developed technology
Business Acquisition [Line Items]
Acquired identifiable intangible assets amortization period					4 years 1 month 6 days	2 years 6 months
Endgame, Inc.
Business Acquisition [Line Items]
Total consideration	$ 234,000,000.0
Issuance of ordinary shares (in shares) | shares	2,218,694
Repayment of assumed debt	$ 20,400,000
Cash deposit to an expense fund	400,000
Cash payment of transaction expenses	5,900,000
Cash payment of withholding taxes	$ 2,800,000
Percentage of shares to be held in indemnity escrow fund	0.11
Number of shares to be held in indemnity escrow fund (in shares) | shares	235,031
Indemnity escrow fund holding period	18 months
Ordinary share price | $ / shares	$ 89.3836
Fair value of shares, consideration transferred (in dollars per share) | $ / shares	$ 84.12
Goodwill	$ 178,764,000
Acquisition related cost incurred by Endgame	1,500,000
Cash paid	26,633,000
Intangible assets	53,800,000
Cash and cash equivalents	2,220,000
Ordinary shares	178,331,000
Endgame, Inc. | General and administrative
Business Acquisition [Line Items]
Cash payment of withholding taxes	2,800,000
Acquisition related costs incurred by the Company	17,500,000
Non-cash expense settled in ordinary shares	$ 8,800,000
Endgame, Inc. | Developed technology
Business Acquisition [Line Items]
Acquired identifiable intangible assets amortization period	5 years
Lambda Lab
Business Acquisition [Line Items]
Issuance of ordinary shares (in shares) | shares		134,474
Goodwill		$ 1,038,000
Share capital acquired in business combination (in percentage)		100.00%
Cash paid		$ 1,997,000
Ordinary shares issued		2,200,000
Stock-based compensation expense					$ 900,000	$ 1,400,000
Lambda Lab | General and administrative
Business Acquisition [Line Items]
Acquisition costs						200,000
Lambda Lab | Developed technology
Business Acquisition [Line Items]
Intangible assets		$ 1,339,000
Estimated useful lives of assets		4 years
Swiftype Inc
Business Acquisition [Line Items]
Goodwill			$ 1,885,000
Share capital acquired in business combination (in percentage)			100.00%
Cash paid			$ 1,724,000
Intangible assets			5,600,000
Cash and cash equivalents			$ 1,100,000
Equity consideration percentage subject to repurchase			15.00%
Ordinary shares issued subject to repurchase (in shares) | shares			109,842
Number of months from the close of the acquisition, shares subject to repurchase			15 months
indemnity claims made during the indemnification period			$ 0
Acquired identifiable intangible assets amortization period			4 years
Ordinary shares			$ 8,392,000
Swiftype Inc | General and administrative
Business Acquisition [Line Items]
Acquisition costs							300,000
Swiftype Inc | Developed technology
Business Acquisition [Line Items]
Intangible assets			$ 5,392,000
Acquired identifiable intangible assets amortization period			4 years
Opbeat
Business Acquisition [Line Items]
Goodwill				$ 4,925,000
Share capital acquired in business combination (in percentage)				100.00%
Cash paid				$ 3,123,000
Cash and cash equivalents				$ 100,000
Equity consideration percentage subject to repurchase				15.00%
Ordinary shares issued subject to repurchase (in shares) | shares				73,349
Number of months from the close of the acquisition, shares subject to repurchase				15 months
indemnity claims made during the indemnification period				$ 0
Ordinary shares				4,019,000
Opbeat | Founders
Business Acquisition [Line Items]
Stock-based compensation expense				$ 900,000	$ 100,000	$ 500,000
Ordinary shares, excluded from purchase consideration (in shares) | shares				93,052
Ordinary shares				$ 900,000
Vesting term (in years)				2 years
Opbeat | Founders | Accrued Expenses and Other Accrued Liabilities | First Year Anniversary
Business Acquisition [Line Items]
Accrued contingent cash payment									$ 700,000
Opbeat | Founders | Accrued Expenses and Other Accrued Liabilities | Second Year Anniversary
Business Acquisition [Line Items]
Accrued contingent cash payment								$ 700,000
Opbeat | General and administrative
Business Acquisition [Line Items]
Acquisition costs							$ 300,000
Opbeat | Developed technology
Business Acquisition [Line Items]
Intangible assets				$ 1,846,000
Acquired identifiable intangible assets amortization period				4 years