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Asbestos - Summary of Net Unfunded AFFA Liability, Net of Tax (Detail) AUD in Millions, $ in Millions | 12 Months Ended
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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 |

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