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Fair Value Of Financial Instruments (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2024
USD ($)
Item
shares
Jun. 30, 2023
USD ($)
Item
Jun. 30, 2022
USD ($)
Aug. 02, 2017
shares
Derivatives, Fair Value [Line Items]            
Outstanding foreign exchange contracts | Item     0 0    
Change in fair value     $ 0 $ 0    
Transfers into or out of Level 3     0 0 $ 0  
Accreted interest     7,214,000 5,078,000    
Foreign currency transaction realized gain     3,700,000      
Net gain related to fair value adjustment to currency options     6,100,000      
(Gain) Loss related to fair value adjustment to currency options $ 2,400,000 $ 2,400,000        
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     21.00% 20.00%    
Cell C [Member] | Minority Discount [Member]            
Derivatives, Fair Value [Line Items]            
Investment fair value measurement inputs     24.00% 24.00%    
Cell C [Member] | Minimum [Member]            
Derivatives, Fair Value [Line Items]            
Increase decrease in weighted average cost of capital     1.00%      
Cell C [Member] | Maximum [Member]            
Derivatives, Fair Value [Line Items]            
Increase decrease in weighted average cost of capital     (1.00%)      
Cell C [Member] | Class A [Member]            
Derivatives, Fair Value [Line Items]            
Investment shares owned | shares     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     20.00%      
Cell C [Member] | Class A [Member] | Minority Discount [Member]            
Derivatives, Fair Value [Line Items]            
Investment fair value measurement inputs     2400.00%