Short-Term Credit Facilities (Narrative) (Details) $ in Thousands, € in Millions, SFr in Millions, R in Millions			9 Months Ended
		Jan. 29, 2018 USD ($)	Mar. 31, 2018 ZAR (R)	Mar. 31, 2018 USD ($)	Mar. 29, 2018	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 CHF (SFr)	Jun. 30, 2017 ZAR (R)	Jun. 30, 2017 USD ($)
Short-term Debt [Line Items]
Amount utilized				$ 3,400					$ 16,579	[1]
United States [Member] | LIBOR [Member]
Short-term Debt [Line Items]
Interest rate					2.31175%
Bank Frick [Member] | United States [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity	[2]			10,000
Amount utilized	[2]			3,400
Termination written notice		42 days
Bank Frick [Member] | Europe [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity	[2]								66,579
Amount utilized	[2]								16,579
Nedbank Limited [Member] | South Africa [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity				33,800					30,600
Amount utilized				9,136					10,000
South African Credit Facility [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity			R 150.0	12,700
Amount utilized			108.0					R 130.5	10,000
South African Credit Facility [Member] | Nedbank Limited [Member]
Short-term Debt [Line Items]
Aggregate amount			400.0	33,800
Primary amount, available immediately			200.0	16,900
Secondary amount, not available immediately			200.0	16,900
Overdraft Facility [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity			R 50.0	$ 4,200
Interest rate			8.85%	8.85%
Commitment fee percentage			0.35%
Overdraft Facility [Member] | South Africa [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity	[2]			$ 21,100					19,109
Overdraft Facility [Member] | Bank Frick [Member] | United States [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 10,000
Interest rate		4.50%
Revolving Overdraft Facility One [Member] | Bank Frick [Member] | Europe [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity | €						€ 40.0
Amount utilized									0
Revolving Overdraft Facility Two [Member] | Bank Frick [Member] | Europe [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity | SFr							SFr 20.0
Amount utilized							SFr 15.9		16,600
Indirect And Derivative Facilities [Member] | South Africa [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity				12,700					11,491
Amount utilized				$ 9,136					$ 10,000

[1] Derived from audited financial statements

[2] Utilized amount included in short-term facilities on the unaudited condensed consolidated balance sheets.