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Financial Risk Management - Additional Information (Detail)
t in Thousands, $ in Millions
12 Months Ended
Jun. 30, 2018
AUD ($)
t
Jun. 30, 2017
AUD ($)
t
Jun. 30, 2018
USD ($)
t
Jun. 30, 2018
CLP ($)
t
Jun. 30, 2018
EUR (€)
t
Jun. 30, 2018
GBP (£)
t
Jun. 30, 2017
USD ($)
t
Jun. 30, 2017
CLP ($)
t
Jun. 30, 2017
EUR (€)
t
Jun. 30, 2017
GBP (£)
t
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Cash Flow at Risk period of worst expected loss relative to projected business plan cash flows 1 year                  
Principal measurement of risk, confidence level 90.00%                  
Percentage of borrowings exposed to floating interest rate 89.00% 90.00%                
Borrowings     $ 26,003       $ 29,577      
Fixed interest rate not swapped to floating rate [member]                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Borrowings     3,019       3,019      
Fixed interest rate not swapped to floating rate [member] | At fair value [member]                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Borrowings     $ 3,434       $ 3,523      
Interest rate risk [member]                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Reasonable possible change in risk, percentage 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk     $ 54       $ 92      
Currency risk [member]                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Effect on equity and profit after taxation, due to reasonable possible change in risk     $ 10       $ 16      
Percentage of net financial liabilities denominated in currency 88.00% 86.00%                
Reasonable possible change in risk, amount $ 0.01 $ 0.01   $ 10 € 0.01 £ 0.01   $ 10 € 0.01 £ 0.01
Commodity price risk [member]                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Reasonable possible change in risk, percentage 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk     $ 9       $ 62      
Commodity price risk [member] | Forward commodity and other derivative contracts [member]                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Net asset fair value     210       358      
Commodity price risk [member] | Significant financial instruments [member]                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Net asset fair value     $ 216       $ 370      
Commodity price risk [member] | Provisionally priced contract [member]                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                    
Reasonable possible change in risk, percentage 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk     $ 178       $ 90      
Tonnes of copper exposure | t 356 213 356 356 356 356 213 213 213 213