Segment Information - Schedule of Long-lived Assets by Geographical Region (Details) - USD ($) $ in Thousands	Jul. 31, 2026	Apr. 30, 2026
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Long-lived assets	$ 1,785,564	$ 44,021
Canada
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Long-lived assets	24,493	25,188
Namibia
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Long-lived assets	1,821	1,906
Spain
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Long-lived assets	487	499
USA
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Long-lived assets	$ 1,758,763	$ 16,428