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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 |  |

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