Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Apr. 30, 2024
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 117,826	$ 88,925
Restricted cash from collections on auto finance receivables for non-recourse notes payable
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	51,699	43,956
Restricted cash on deposit in reserve accounts for non-recourse notes payable
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 66,127	$ 44,969