Income Taxes - Additional Information (Details) - Federal Income Tax - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Jan. 31, 2023	Apr. 30, 2022	Apr. 30, 2021
Operating Loss Carryforwards [Line Items]
Cumulative net operating loss	$ 45	$ 39	$ 34
Net operating loss carry-forward expiration year	2028	2028

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant