Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Asbestos - Summary of Net Unfunded AFFA Liability, Net of Tax (Detail)

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Asbestos - Summary of Net Unfunded AFFA Liability, Net of Tax (Detail)
AUD in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
AUD
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Asbestos Claims [Line Items]        
Net Unfunded AFFA liability, net of tax, Beginning Balance $ (766.7)      
Payment received in accordance with AFFA 91.1 AUD 120.7    
AICF operating costs paid - non claims-handling (1.5)   $ (1.7) $ (2.5)
Change in actuarial estimate 36.5      
Change in claims handling cost estimate 2.1   1.2 $ 1.1
Impact on deferred income tax due to change in actuarial estimate (11.5)      
Movement in income tax payable (19.1)      
Other movements (1.2)      
Effect of foreign exchange 2.7      
Net Unfunded AFFA liability, net of tax, Ending Balance (667.6)   (766.7)  
Asbestos Liability [Member]        
Asbestos Claims [Line Items]        
Net Unfunded AFFA liability, net of tax, Beginning Balance (1,302.2)      
Asbestos claims paid 90.7      
AICF claims-handling costs incurred (paid) 1.2      
Change in actuarial estimate 44.7      
Change in claims handling cost estimate 2.1      
Effect of foreign exchange 3.8      
Net Unfunded AFFA liability, net of tax, Ending Balance (1,159.7)   (1,302.2)  
Insurance Receivables [Member]        
Asbestos Claims [Line Items]        
Net Unfunded AFFA liability, net of tax, Beginning Balance 165.7      
Change in actuarial estimate (8.2)      
Insurance recoveries (93.3)      
Effect of foreign exchange (0.4)      
Net Unfunded AFFA liability, net of tax, Ending Balance 63.8   165.7  
Deferred Tax Assets [Member]        
Asbestos Claims [Line Items]        
Net Unfunded AFFA liability, net of tax, Beginning Balance 384.9      
Impact on deferred income tax due to change in actuarial estimate (11.5)      
Movement in income tax payable (16.6)      
Other movements 0.8      
Effect of foreign exchange (1.0)      
Net Unfunded AFFA liability, net of tax, Ending Balance 356.6   384.9  
Other Loan Facilities [Member]        
Asbestos Claims [Line Items]        
Net Unfunded AFFA liability, net of tax, Beginning Balance (50.7)      
Funds received from NSW under loan agreement (77.0)      
Funds repaid to NSW under loan agreement 74.3      
Effect of foreign exchange 1.0      
Net Unfunded AFFA liability, net of tax, Ending Balance (52.4)   (50.7)  
Restricted Cash and Investments [Member]        
Asbestos Claims [Line Items]        
Net Unfunded AFFA liability, net of tax, Beginning Balance 17.0      
Asbestos claims paid (90.7)      
Payment received in accordance with AFFA 91.1      
AICF claims-handling costs incurred (paid) (1.2)      
AICF operating costs paid - non claims-handling (1.5)      
Insurance recoveries 93.3      
Funds received from NSW under loan agreement 77.0      
Funds repaid to NSW under loan agreement (74.3)      
Other movements (0.6)      
Effect of foreign exchange (1.2)      
Net Unfunded AFFA liability, net of tax, Ending Balance 108.9   17.0  
Other Assets and Liabilities [Member]        
Asbestos Claims [Line Items]        
Net Unfunded AFFA liability, net of tax, Beginning Balance 18.6      
Movement in income tax payable (2.5)      
Other movements (1.4)      
Effect of foreign exchange 0.5      
Net Unfunded AFFA liability, net of tax, Ending Balance $ 15.2   $ 18.6