Borrowings (Summary Of Short-Term Credit Facilities) (Details) $ in Thousands, R in Millions		3 Months Ended
		Sep. 30, 2018 ZAR (R)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 14, 2018 USD ($)
Short-term Debt [Line Items]
Short-term facility available			$ 165,546
Balance as of June 30, 2018	[1]
Utilized			84,655	$ 31,880
Balance as of Septmeber 30, 2018			3,313
Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available			31,211
Utilized			84,655
Foreign currency adjustment	[2]		3,436
Balance as of Septmeber 30, 2018			88,091
Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available			123,730
Balance as of Septmeber 30, 2018			84,778
Overdraft Facility [Member] | No Restrictions As To Use [Member]
Short-term Debt [Line Items]
Balance as of Septmeber 30, 2018			3,313
Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available			10,605
Balance as of June 30, 2018			7,871
Guarantees cancelled			(848)
Utilized			2,436
Foreign currency adjustment	[2]		(110)
Balance as of Septmeber 30, 2018			9,349
South Africa [Member] | Amended July 2017 [Member]
Short-term Debt [Line Items]
Short-term facility available			106,054
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			73,500
Foreign currency adjustment	[2]		3,105
Balance as of Septmeber 30, 2018			76,605
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			106,054
Balance as of Septmeber 30, 2018			76,605
South Africa [Member] | Amended July 2017 [Member] | Overdraft Facility [Member] | No Restrictions As To Use [Member]
Short-term Debt [Line Items]
Balance as of Septmeber 30, 2018
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	[2]
Balance as of Septmeber 30, 2018
South Africa [Member] | Nedbank Limited [Member]
Short-term Debt [Line Items]
Short-term facility available			49,492
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available			21,211
Balance as of June 30, 2018
Utilized			7,842
Foreign currency adjustment	[2]		331
Balance as of Septmeber 30, 2018			8,173
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			17,676
Balance as of Septmeber 30, 2018		R 115.6	8,173
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member] | No Restrictions As To Use [Member]
Short-term Debt [Line Items]
Balance as of Septmeber 30, 2018
South Africa [Member] | Nedbank Limited [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available			10,605
Balance as of June 30, 2018			7,871
Guarantees cancelled			(848)
Utilized			2,436
Foreign currency adjustment	[2]		(110)
Balance as of Septmeber 30, 2018			9,349
United States [Member] | Bank Frick [Member]
Short-term Debt [Line Items]
Short-term facility available			10,000
United States [Member] | Bank Frick [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available			10,000
Balance as of June 30, 2018
Utilized			3,313
Foreign currency adjustment	[2]
Balance as of Septmeber 30, 2018			3,313
United States [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 Septmeber 30, 2018
United States [Member] | Bank Frick [Member] | Overdraft Facility [Member] | No Restrictions As To Use [Member]
Short-term Debt [Line Items]
Balance as of Septmeber 30, 2018			3,313
United States [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	[2]
Balance as of Septmeber 30, 2018
United States [Member] | Bank Frick [Member] | Renewed [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available					$ 10,000

[1] Certain amounts shown here do not correspond to the Company's 2018 financial statements and reflects an adjustment made, refer to Note 1 See Notes to Unaudited Condensed Consolidated Financial Statements

[2] Represents the effects of the fluctuations between the ZAR and the U.S. dollar.