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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Derivatives, Fair Value [Line Items]      
Transfers into or out of Level 3 $ 0 $ 0  
Change in fair value 0 $ 0  
Nonrecurring [Member]      
Derivatives, Fair Value [Line Items]      
Liabilities measured at fair value 0    
Cell C [Member]      
Derivatives, Fair Value [Line Items]      
Investment amount owned $ 0.0   $ 0.0
Equity method investment, percentage of ownership interest 0.00%    
Cell C [Member] | Marketability Discount [Member]      
Derivatives, Fair Value [Line Items]      
Investment fair value measurement inputs 15.00%   15.00%
Cell C [Member] | Minority Discount [Member]      
Derivatives, Fair Value [Line Items]      
Investment fair value measurement inputs 17.00%   17.00%
Cell C [Member] | Weighted Average Cost of Capital (WACC) Rate [Member]      
Derivatives, Fair Value [Line Items]      
Increase decrease in weighted average cost of capital (2.50%)    
Investment fair value measurement inputs 23.00%   24.00%
Cell C [Member] | Measurement Input Ebitda Multiple [Member]      
Derivatives, Fair Value [Line Items]      
Increase decrease in weighted average cost of capital 2.50%    
Cell C [Member] | Class A [Member]      
Derivatives, Fair Value [Line Items]      
Investment shares owned 75,000,000    
Cell C [Member] | Class A [Member] | Marketability Discount [Member]      
Derivatives, Fair Value [Line Items]      
Investment fair value measurement inputs 15.00%    
Cell C [Member] | Class A [Member] | Minority Discount [Member]      
Derivatives, Fair Value [Line Items]      
Investment fair value measurement inputs 17.00%