v3.26.1
Fair Value Of Financial Instruments (Narrative) (Details)
R in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
shares
Mar. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
shares
Mar. 31, 2026
ZAR (R)
shares
Mar. 31, 2025
USD ($)
Jun. 30, 2025
Mar. 31, 2026
ZAR (R)
shares
Derivatives, Fair Value [Line Items]              
Transfers into or out of Level 3 | $   $ 0     $ 0    
Change in fair value | $ $ 0 $ 0 $ 0   $ 0    
Nonrecurring [Member]              
Derivatives, Fair Value [Line Items]              
Liabilities measured at fair value | $ $ 0   $ 0        
Cell C [Member]              
Derivatives, Fair Value [Line Items]              
Investment shares owned | shares 75,000,000   75,000,000       75,000,000
Shares exchanged | shares     75,000,000 75,000,000      
Investment amount owned | $ $ 0.0   $ 0.0        
Cell C [Member] | Marketability Discount [Member]              
Derivatives, Fair Value [Line Items]              
Investment fair value measurement inputs           15.00%  
Cell C [Member] | Minority Discount [Member]              
Derivatives, Fair Value [Line Items]              
Investment fair value measurement inputs           17.00%  
Cell C [Member] | Maximum [Member] | Listing by November 30, 2025 and Value of Shares Less Than ZAR 50 Million [Member]              
Derivatives, Fair Value [Line Items]              
Sale price of shares     $ 3,000,000.0 R 50      
Investment amount owned | R             R 50
Cell C [Member] | Maximum [Member] | Listing Not Occur by November 30 2025 and Shares Sold [Member]              
Derivatives, Fair Value [Line Items]              
Sale price of shares | R       R 35      
Cell C [Member] | Class A [Member]              
Derivatives, Fair Value [Line Items]              
Investment shares owned | shares 75,000,000   75,000,000       75,000,000
Cell C [Member] | Class A [Member] | Marketability Discount [Member]              
Derivatives, Fair Value [Line Items]              
Investment fair value measurement inputs     15.00% 15.00%      
Cell C [Member] | Class A [Member] | Minority Discount [Member]              
Derivatives, Fair Value [Line Items]              
Investment fair value measurement inputs     17.00% 17.00%      
Cell C Listco [Member]              
Derivatives, Fair Value [Line Items]              
Investment shares owned | shares 76,590   76,590       76,590