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Financial Instrument Risk - Foreign Exchange Rate Sensitivity (Details) - RON - Currency risk - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible increase in risk variable, percent 3.00% 4.00%
Reasonably possible decrease in risk variable, percent 5.00% 5.00%
Reasonably possible increase in risk variable, impact on profit £ (330) £ (330)
Reasonably possible decrease in risk variable, impact on profit 521 483
Reasonably possible increase in risk variable, impact on equity £ (283) £ (672)