Related Party Transactions - Narrative (Details)		1 Months Ended					12 Months Ended
		Sep. 30, 2020 USD ($)	Jun. 30, 2020	Oct. 31, 2019 USD ($) transaction $ / shares shares	Jun. 30, 2019 USD ($)	Jan. 31, 2018 USD ($) renewalPeriod shares	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Related Party Transaction [Line Items]
Stock repurchased in period, per share (in dollars per share) | $ / shares				$ 30.2310
Deferred costs, sales commissions, amortization period							5 years
Deferred costs, sales commissions							$ 75,227,000	$ 60,295,000	$ 91,225,000
Accounts receivable, net, from related party							15,180,000	250,000
Deferred revenue, current	[1]						72,263,000	53,537,000
Accounts payable, from related party							56,000	0
Software Subscription Agreement | Baker Hughes Company
Related Party Transaction [Line Items]
Revenue commitment, fiscal year 2020					$ 46,700,000
Revenue commitment, fiscal year 2021					53,300,000
Revenue commitment, fiscal year 2022					75,000,000.0
Revenue commitment, fiscal year 2023					125,000,000.0
Revenue commitment, fiscal year 2024					$ 150,000,000.0
Chief Executive Officer (CEO)
Related Party Transaction [Line Items]
Notes receivable						$ 24,500,000
Notes receivable, term						5 years
Notes receivable, number of renewal periods | renewalPeriod						4
Notes receivable, renewal period						1 year
Interest rate						2.18%
Proceeds from notes receivable payment		$ 26,000,000.0
Chief Executive Officer (CEO) | Secondary Stock Sale to Existing Shareholder
Related Party Transaction [Line Items]
Number of secondary transactions | transaction				2
Total proceeds				$ 50,000,000.0
Officers and Employees
Related Party Transaction [Line Items]
Stock repurchased in period, per share (in dollars per share) | $ / shares				$ 30.2310
Baker Hughes Company | Software Subscription Agreement
Related Party Transaction [Line Items]
Revenue commitment, term			5 years		3 years
Related party revenue							55,900,000
Sales commissions, recognized as deferred costs							$ 8,300,000
Deferred costs, sales commissions, amortization period							5 years
Deferred costs, sales commissions, prepaid expense and other current assets							$ 1,700,000
Deferred costs, sales commissions, prepaid expense and other noncurrent assets							6,600,000
Deferred costs, sales commissions, term					3 years
Due to related parties, current							3,400,000
Due to related parties, noncurrent							4,900,000
Deferred costs, sales commissions								0	0
Accounts receivable, net, from related party							15,200,000	300,000
Deferred revenue, current							7,700,000	1,500,000
Costs of subscription revenue							100,000	0	0
Accounts payable, from related party							100,000	0
Baker Hughes Company | Software Subscription Agreement | Subscription
Related Party Transaction [Line Items]
Related party revenue							30,600,000	40,400,000	100,000
Baker Hughes Company | Software Subscription Agreement | Professional services
Related Party Transaction [Line Items]
Related party revenue							$ 4,800,000	$ 300,000	$ 0
Series F Preferred Stock | Chief Executive Officer (CEO)
Related Party Transaction [Line Items]
Stock issued during period (in shares) | shares						1,251,921
Series D Preferred Stock | Chief Executive Officer (CEO) | Secondary Stock Sale to Existing Shareholder | Existing Stockholder, Transaction One
Related Party Transaction [Line Items]
Sale of stock, number of shares (in shares) | shares				1,685,979
Sale of stock, shares issued, price per share (in dollars per share) | $ / shares				$ 26.6034
Series D Preferred Stock | Chief Executive Officer (CEO) | Secondary Stock Sale to Existing Shareholder | Existing Stockholder, Transaction Two
Related Party Transaction [Line Items]
Sale of stock, number of shares (in shares) | shares				825,012
Sale of stock, shares issued, price per share (in dollars per share) | $ / shares				$ 24.0000
Series E Preferred Stock | Chief Executive Officer (CEO) | Secondary Stock Sale to Existing Shareholder | Existing Stockholder, Transaction One
Related Party Transaction [Line Items]
Sale of stock, number of shares (in shares) | shares				193,489
Sale of stock, shares issued, price per share (in dollars per share) | $ / shares				$ 26.6034
Series C Preferred Stock | Chief Executive Officer (CEO) | Secondary Stock Sale to Existing Shareholder | Existing Stockholder, Transaction Two
Related Party Transaction [Line Items]
Sale of stock, number of shares (in shares) | shares				584,795
Sale of stock, shares issued, price per share (in dollars per share) | $ / shares				$ 24.0000
Redeemable Convertible A-1 Common Stock | Chief Executive Officer (CEO) | Secondary Stock Sale to Existing Shareholder | Existing Stockholder, Transaction Two
Related Party Transaction [Line Items]
Sale of stock, number of shares (in shares) | shares				673,526
Sale of stock, shares issued, price per share (in dollars per share) | $ / shares				$ 24.0000

[1] Including amounts from a related party of $7,697 and $1,499 as of April 30, 2021 and 2020, respectively.