Equity-Accounted Investments And Other Long-Term Assets (Summary Of Other Long-Term Asset) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022		Jun. 30, 2021
Schedule Of Equity And Held To Maturity Investments [Line Items]
Total equity investments	$ 76,297	$ 76,297
Policy holder assets under investment contracts (Note 12)	261	371
Reinsurance assets under insurance contracts (Note 12)	1,276	1,424
Total other long-term assets	77,834	78,092	[1]
Accounts receivable, allowances	272	509		$ 267
Carbon Tech Limited [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Long-term portion of amount due from sale of interest	0	0
Accounts receivable, allowances		1,000
Loan [Member] | Carbon Tech Limited [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Notes payable amount	750
Debt, face value	3,000
Accounts receivable, allowances	750
Mobikwik [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Total equity investments	$ 76,297	$ 76,297
Equity-accounted investments, ownership percentage	10.00%	10.00%
Cell C [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Total equity investments	$ 0	$ 0
Equity-accounted investments, ownership percentage	5.00%	15.00%
CPS [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Total equity investments	$ 0	$ 0
Equity-accounted investments, ownership percentage	87.50%	87.50%
Cedar Cellular [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Equity-accounted investments, ownership percentage	7.625%
Cedar Cellular [Member] | 8.625% Notes [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Interest rate	8.625%

[1] (A) – Derived from audited financial statements