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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 24, 2022
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2022
Derivatives, Fair Value [Line Items]              
Transfers into or out of Level 3         $ 0 $ 0  
Movement in carrying value of assets measured on a recurring basis         0 0  
Net gain related to fair value adjustment to currency options     $ 6,100,000     3,700,000  
Loss related to fair value adjustment to currency options   $ 0 2,391,000     (38,000)  
(Gain) Loss Related To Fair Value Adjustment To Currency Options   0 $ 6,120,000   0 $ 3,691,000  
Nonrecurring [Member]              
Derivatives, Fair Value [Line Items]              
Liabilities measured at fair value   0     0    
Foreign Exchange Contracts [Member]              
Derivatives, Fair Value [Line Items]              
Notional amount   0     0   $ 0
Foreign currency transaction realized gain $ 3,700,000            
(Gain) Loss Related To Fair Value Adjustment To Currency Options       $ (2,400,000)      
Cell C [Member]              
Derivatives, Fair Value [Line Items]              
Investment amount owned   $ 0.0     $ 0.0   $ 0.0
Equity method investment, percentage of ownership interest   0.00%     0.00%    
Cell C [Member] | Marketability Discount [Member]              
Derivatives, Fair Value [Line Items]              
Investment fair value measurement inputs         20.00%   10.00%
Cell C [Member] | Minority Discount [Member]              
Derivatives, Fair Value [Line Items]              
Investment fair value measurement inputs         30.00%   15.00%
Cell C [Member] | Shareholding Percentage [Member]              
Derivatives, Fair Value [Line Items]              
Investment fair value measurement inputs         5.00%   15.00%
Cell C [Member] | Class A [Member]              
Derivatives, Fair Value [Line Items]              
Investment shares owned   75,000,000     75,000,000