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Equity-Accounted Investments And Other Long-Term Assets (Narrative) (Details) R / shares in Units, R in Millions |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 10, 2023 USD ($) | Aug. 10, 2023 ZAR (R) R / shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) shares | Sep. 30, 2024 USD ($) | Jun. 30, 2024 | Jun. 30, 2022 USD ($)
Change in fair value of equity securities |  |  | $ (33,731,000) | $ 0 |  |  | $ (33,731,000) | $ 0 |  |  |
Equity Method Investment Realized Gain Loss On Disposal |  |  | $ (161,000) | $ 0 |  |  | (161,000) | $ 0 |  |  |
Finbond [Member] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold | shares |  |  |  | 7,379,656 |  |  |  | 7,379,656 |  |  |
Cash consideration received on transaction | $ 3,500,000 | R 64.2 |  |  |  |  |  |  |  |  |
Impairment loss on equity method investment |  |  |  |  | $ 1,200,000 |  |  |  |  |  |
Sale price per share | R / shares |  | R 0.2911 |  |  |  |  |  |  |  |  |
Equity Method Investment Realized Gain Loss On Disposal |  |  |  | $ 0 |  |  |  | $ 0 |  |  |
Carbon [Member] |  |  |  |  |  |  |  |  |  |  |
Investment amount owned |  |  |  |  |  |  |  |  |  |  | $ 0
Cash consideration received on transaction |  |  |  |  |  | $ 500,000 |  |  |  |  |
Percentage of retained equity ownership interest disposed |  |  |  |  |  | 25.00% |  |  |  |  |
Amount received at closing from interest sold |  |  |  |  |  |  | 250,000 |  |  |  |
Sale of interest, amount owned in twelve months |  |  |  |  | $ 250,000 |  |  |  |  |  |
Sale of interest, remaining amount |  |  |  |  |  |  | $ 750,000 |  |  |  |
Carbon [Member] | Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Notes payable amount |  |  |  |  |  | $ 750,000 |  |  |  |  |
Debt, face value |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |
Mobikwik [Member] |  |  |  |  |  |  |  |  |  |  |
Equity-accounted investments, ownership percentage |  |  | 8.00% |  |  |  | 8.00% |  |  | 10.00% |
Investment amount owned |  |  | $ 42,600,000 |  |  |  | $ 42,600,000 |  | $ 76,300,000 |  |
Investment shares owned | shares |  |  | 6,215,620 |  |  |  | 6,215,620 |  |  |  |
Impairment loss on equity method investment |  |  | $ 33,700,000 |  |  |  | $ 33,700,000 |  |  |  |

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