Borrowings (Summary Of Short-Term Credit Facilities) (Details) $ in Thousands, R in Millions, ₩ in Billions	3 Months Ended			9 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	[1]	Mar. 31, 2019 ZAR (R)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	[1]	Feb. 04, 2019 USD ($)	Jan. 01, 2019 KRW (₩)	Jan. 01, 2019 USD ($)	Sep. 14, 2018 USD ($)
Short-term Debt [Line Items]
Short-term facility available	$ 163,471				$ 163,471
Utilized	278,288	$ 9,802			584,525	$ 42,372
Repaid	(12,499)	$ (15,826)			(36,310)	$ (60,967)
Balance as of March 31, 2019	8,865				8,865
Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	32,245				32,245
Utilized					584,525
Repaid					(502,823)
Foreign currency adjustment					1,344
Balance as of March 31, 2019	83,046				83,046
Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	120,866				120,866
Balance as of March 31, 2019	74,181				74,181
Overdraft Facility [Member] | No Restrictions As To Use [Member]
Short-term Debt [Line Items]
Balance as of March 31, 2019	8,865				8,865
Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	10,360				10,360
Balance as of June 30, 2018					7,871
Guarantees cancelled					(829)
Utilized					47
Foreign currency adjustment					(411)
Balance as of March 31, 2019	6,678				6,678
South Africa [Member] | Amended July 2017 [Member]
Short-term Debt [Line Items]
Short-term facility available	103,599				103,599
South Africa [Member] | Amended July 2017 [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available
Balance as of June 30, 2018
Utilized					506,472
Repaid					(434,629)
Foreign currency adjustment					945
Balance as of March 31, 2019	72,788				72,788
South Africa [Member] | Amended July 2017 [Member] | Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	103,599				103,599
Balance as of March 31, 2019	72,788				72,788
South Africa [Member] | Amended July 2017 [Member] | Overdraft Facility [Member] | No Restrictions As To Use [Member]
Short-term Debt [Line Items]
Balance as of March 31, 2019
South Africa [Member] | Amended July 2017 [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available
Balance as of June 30, 2018
Guarantees cancelled
Utilized
Foreign currency adjustment
Balance as of March 31, 2019
South Africa [Member] | Nedbank Limited [Member]
Short-term Debt [Line Items]
Short-term facility available	31,080				31,080
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	3,453				3,453
Balance as of June 30, 2018
Utilized					64,196
Repaid					(63,202)
Foreign currency adjustment					399
Balance as of March 31, 2019	1,393				1,393
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	17,267				17,267
Balance as of March 31, 2019	1,393				1,393
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member] | No Restrictions As To Use [Member]
Short-term Debt [Line Items]
Balance as of March 31, 2019
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member] | Nedbank Short-Term Credit Facility [Member]
Short-term Debt [Line Items]
Balance as of March 31, 2019	5,600			R 81.4	5,600
Total overdraft facilities withdrawn					5,600
South Africa [Member] | Nedbank Limited [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	10,360				10,360
Balance as of June 30, 2018					7,871
Guarantees cancelled					(829)
Utilized					47
Foreign currency adjustment					(411)
Balance as of March 31, 2019	6,678				6,678
United States [Member] | Bank Frick [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available								$ 20,000
Balance as of March 31, 2019	8,900				8,900
United States [Member] | Bank Frick [Member] | Renewed [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available											$ 10,000
South Korea [Member] | Bank Frick [Member]
Short-term Debt [Line Items]
Short-term facility available	20,000				20,000
South Korea [Member] | Bank Frick [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	20,000				20,000
Balance as of June 30, 2018
Utilized					13,857
Repaid					(4,992)
Foreign currency adjustment
Balance as of March 31, 2019	8,865				8,865
South Korea [Member] | Bank Frick [Member] | Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available
Balance as of March 31, 2019
South Korea [Member] | Bank Frick [Member] | Overdraft Facility [Member] | No Restrictions As To Use [Member]
Short-term Debt [Line Items]
Balance as of March 31, 2019	8,865				8,865
South Korea [Member] | Bank Frick [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available
Balance as of June 30, 2018
Guarantees cancelled
Utilized
Foreign currency adjustment
Balance as of March 31, 2019
South Korea [Member] | Hana Bank [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available									₩ 10	$ 10,000

[1] Refer to Note 1.