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Financial instruments, Sensitivity Analysis (Details) - Foreign Currency Risk [Member] - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
10% Strengthened [Member]    
Sensitivity analysis [Abstract]    
Strengthened / weakened, effect on profit before tax $ (4) $ (75)
Strengthened / weakened, effect on equity (4) (75)
10% Weakened [Member]    
Sensitivity analysis [Abstract]    
Strengthened / weakened, effect on profit before tax 23 (105)
Strengthened / weakened, effect on equity 23 (105)
US Dollar [Member] | 10% Strengthened [Member]    
Sensitivity analysis [Abstract]    
Strengthened / weakened, effect on profit before tax (1,238) 1,296
Strengthened / weakened, effect on equity (1,238) 1,296
US Dollar [Member] | 10% Weakened [Member]    
Sensitivity analysis [Abstract]    
Strengthened / weakened, effect on profit before tax 1,513 (1,584)
Strengthened / weakened, effect on equity 1,513 (1,584)
Canadian Dollar [Member] | 10% Strengthened [Member]    
Sensitivity analysis [Abstract]    
Strengthened / weakened, effect on profit before tax 23,386 6,733
Strengthened / weakened, effect on equity 23,386 6,733
Canadian Dollar [Member] | 10% Weakened [Member]    
Sensitivity analysis [Abstract]    
Strengthened / weakened, effect on profit before tax (23,386) (6,733)
Strengthened / weakened, effect on equity (23,386) (6,733)
Australian Dollar [Member] | 10% Strengthened [Member]    
Sensitivity analysis [Abstract]    
Strengthened / weakened, effect on profit before tax (22,152) (8,104)
Strengthened / weakened, effect on equity (22,152) (8,104)
Australian Dollar [Member] | 10% Weakened [Member]    
Sensitivity analysis [Abstract]    
Strengthened / weakened, effect on profit before tax 21,896 8,212
Strengthened / weakened, effect on equity $ 21,896 $ 8,212