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Additional information-Financial Statement Schedule I - Condensed statement of changes in equity (Details)
 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
GBP (£)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
GBP (£)
Condensed statement of changes in equity            
Equity at beginning of period   £ 477,617,000   £ 458,282,000   £ 477,918,000
(Loss)/profit for the year   (37,270,000)   39,177,000   36,371,000
Total comprehensive (loss)/income for the year   (33,284,000)   40,442,000   (1,347,000)
Equity-settled share-based payments   2,915,000   2,187,000   1,795,000
Dividends paid $ (29,555,000) (21,982,000) $ (29,525,000) (23,295,000) $ (29,501,000) (20,084,000)
Proceeds from shares issued       1,000    
Equity at end of period   425,266,000   477,617,000   458,282,000
Share capital            
Condensed statement of changes in equity            
Equity at beginning of period   53,000   52,000   52,000
Proceeds from shares issued       1,000    
Equity at end of period   53,000   53,000   52,000
Share premium            
Condensed statement of changes in equity            
Equity at beginning of period   68,822,000   68,822,000   68,822,000
Equity at end of period   68,822,000   68,822,000   68,822,000
Retained earnings            
Condensed statement of changes in equity            
Equity at beginning of period   191,436,000   173,367,000   155,285,000
(Loss)/profit for the year   (37,270,000)   39,177,000   36,371,000
Total comprehensive (loss)/income for the year   (37,270,000)   39,177,000   36,371,000
Equity-settled share-based payments   2,915,000   2,187,000   1,795,000
Dividends paid   (21,982,000)   (23,295,000)   (20,084,000)
Equity at end of period   135,099,000   191,436,000   173,367,000
Parent Company            
Condensed statement of changes in equity            
Equity at beginning of period   317,189,000   317,014,000   315,303,000
(Loss)/profit for the year   18,559,000   21,282,000   20,000,000
Total comprehensive (loss)/income for the year   18,559,000   21,282,000   20,000,000
Equity-settled share-based payments   2,915,000   2,187,000   1,795,000
Dividends paid   (21,982,000)   (23,295,000)   (20,084,000)
Proceeds from shares issued       1,000    
Equity at end of period   316,681,000   317,189,000   317,014,000
Parent Company | Share capital            
Condensed statement of changes in equity            
Equity at beginning of period   53,000   52,000   52,000
Proceeds from shares issued       1,000    
Equity at end of period   53,000   53,000   52,000
Parent Company | Share premium            
Condensed statement of changes in equity            
Equity at beginning of period   68,822,000   68,822,000   68,822,000
Equity at end of period   68,822,000   68,822,000   68,822,000
Parent Company | Retained earnings            
Condensed statement of changes in equity            
Equity at beginning of period   248,314,000   248,140,000   246,429,000
(Loss)/profit for the year   18,559,000   21,282,000   20,000,000
Total comprehensive (loss)/income for the year   18,559,000   21,282,000   20,000,000
Equity-settled share-based payments   2,915,000   2,187,000   1,795,000
Dividends paid   (21,982,000)   (23,295,000)   (20,084,000)
Equity at end of period   £ 247,806,000   £ 248,314,000   £ 248,140,000