| Line Item | Jun 30, 2026 | Jun 30, 2025 | Jun 30, 2024 | Jun 30, 2023 | Jun 30, 2022 | Jun 30, 2021 | Jun 30, 2020 | Jun 30, 2019 | Jun 30, 2018 |
|---|---|---|---|---|---|---|---|---|---|
| Profit or loss [abstract] | |||||||||
| Revenue | |||||||||
| Cost of sales | |||||||||
| Gross Profit from operating activities | |||||||||
| Other income | |||||||||
| Administration expenses and other costs | |||||||||
| Loss on disposal of subsidiary | |||||||||
| Results from operating activities | |||||||||
| Finance income | |||||||||
| Finance expense | |||||||||
| Profit before tax | |||||||||
| Income tax | |||||||||
| Profit for the year | |||||||||
| Items that will not be reclassified to profit or loss, net of tax | |||||||||
| Net fair value adjustment on equity investments at fair value through other comprehensive income | |||||||||
| Fair value adjustment on equity investments at fair value through other comprehensive income | |||||||||
| Deferred tax thereon | |||||||||
| Total other comprehensive income | |||||||||
| Total comprehensive income | |||||||||
| Earnings per share [abstract] | |||||||||
| Basic earnings per share (in SA cents per share) | |||||||||
| Diluted earnings per share (in SA cents per share) |