Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands	Jul. 31, 2026	Apr. 30, 2026
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	$ 82,445	$ 84,684
Restricted cash from collections on auto finance receivables for non-recourse notes payable
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	35,531	38,385
Restricted cash on deposit in reserve accounts for non-recourse notes payable
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	41,852	41,848
Restricted cash for letter of credit
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	$ 5,062	$ 4,451

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.