Related Party Transactions (Narrative) (Details) $ in Millions	3 Months Ended
Sep. 30, 2018 USD ($)
Executive Officers [Member]
Related Party Transaction [Line Items]
Percentage of direct shareholding	16.00%
JAA Holdings Proprietary Limited [Member]
Related Party Transaction [Line Items]
Maturity date	Oct. 31, 2018
JAA Holdings Proprietary Limited [Member] \| South African Prime Rate [Member]
Related Party Transaction [Line Items]
Interest rate	10.00%
JAA Holdings Proprietary Limited [Member] \| Executive Officers [Member]
Related Party Transaction [Line Items]
Loan payable	$ 0.1
DNI [Member]
Related Party Transaction [Line Items]
Amount paid for rental	$ 1.0

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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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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The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date, which accrues interest at a rate subject to change from time to time.

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