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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Acquisition And Disposal Of Controlling Interest In DNI (Narrative) (Details) R in Millions, $ in Millions			1 Months Ended	3 Months Ended	9 Months Ended
	May 03, 2019 ZAR (R) shares	May 03, 2019 USD ($) shares	Apr. 30, 2019	Mar. 31, 2019 USD ($)	Mar. 31, 2019 ZAR (R)	Mar. 31, 2019 USD ($)
Discontinued [Member] \| DNI [Member]
Business Acquisition [Line Items]
Percentage of ownership interest prior to disposal					38.00%	38.00%
DNI [Member]
Business Acquisition [Line Items]
Percentage of ownership interest prior to disposal					55.00%	55.00%
Percentage of ownership interest after disposal					38.00%	38.00%
DNI [Member]
Business Acquisition [Line Items]
Settlement of contingent consideration					R 400.0
DNI [Member] \| As Reported [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets \| $				$ 7.0		$ 7.0
Deferred taxes on intangible assets \| $				$ 2.0		$ 2.0
Transaction to sell 17% [Member] \| Discontinued [Member] \| DNI [Member]
Business Acquisition [Line Items]
Percentage of ownership interest prior to disposal					55.00%	55.00%
Percentage of ownership interest after disposal					38.00%	38.00%
Settlement of contingent consideration					R 400.0	$ 27.6
Subsequent Event [Member] \| Discontinued [Member] \| DNI [Member] \| Call Option [Member]
Business Acquisition [Line Items]
Option strike price used to calculate strike price for 30% retained nterest	R 2,827.0	$ 195.2
Option strike price of 30% retained interest	R 859.3	$ 59.3
Minimum smaller denominations call options can be split, percent	20.00%	20.00%
Percentage of voting and participation interests required to be acquired by nominated party to excercise call option	2.50%	2.50%
Subsequent Event [Member] \| Transaction to sell 8% [Member] \| Discontinued [Member] \| DNI [Member]
Business Acquisition [Line Items]
Percentage of ownership interest prior to disposal	38.00%	38.00%
Percentage of ownership interest after disposal	30.00%	30.00%
Settlement of contingent consideration	R 230.0
Number of ordinary "A" shares in DNI sold \| shares	7,605,235	7,605,235
Repayment of long-term borrowings	R 15.0
Consideration transferred	R 215.0	$ 14.8
Percentage of ownership interest sold in business			8.00%