Acquisition of Sandstorm Gold and Horizon Copper - Pro Forma Information (Details) - Sandstorm And Horizon - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Business Combination [Line Items]
Revenue	$ 1,209	$ 904
Net income available to Royal Gold common stockholders	$ 444	$ 362

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details