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Share Options - Joint Share Ownership Plan (Details)
12 Months Ended
Jun. 30, 2018
year
shares
Jun. 30, 2017
year
shares
Joint Share Ownership Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expiration period 25 years  
Number of shares in entity held by entity or by its subsidiaries or associates (in shares) 3,440,465 3,440,465
Weighted average remaining contractual life | year 19 20
Joint Share Ownership Plan - EBT Portion    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares in entity held by entity or by its subsidiaries or associates (in shares) 4,703,980 4,703,980