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Operating Segment Information and Concentrations of Risk - Operating Segments and Geographical Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,728.2 | $ 1,656.9 | $ 1,493.8
Total operating income | 354.0 | 335.0 | 53.1
Net interest expense | (25.6) | (7.5) | (1.1)
Other income (expense) | 2.1 | (4.9) | 2.6
Total Identifiable Assets | 2,040.4 | 2,044.5 |
General Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (43.6) | (19.0) | (240.6)
Total Identifiable Assets | 785.4 | 784.7 |
Asia Pacific Fiber Cement [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 341.9 | 380.4 | 366.2
Total operating income | 80.9 | 94.1 | 81.1
Total Identifiable Assets | 297.4 | 279.8 |
Research and Development [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (23.9) | (26.0) | (24.4)
Total Identifiable Assets | 13.6 | 20.7 |
North America & Europe Fiber Cement [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,386.3 | 1,276.5 | 1,127.6
Total operating income | 340.6 | 285.9 | 237.0
Total Identifiable Assets | 944.0 | 959.3 |
Australia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 228.4 | 267.7 | 259.2
Total Identifiable Assets | 232.4 | 223.4 |
New Zealand [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 61.4 | 64.7 | 63.0
Total Identifiable Assets | 26.5 | 25.8 |
Other Countries [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 89.6 | 86.0 | 77.0
Total Identifiable Assets | 71.0 | 54.2 |
Segments Total [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | 397.6 | 354.0 | 293.7
Total Identifiable Assets | 1,255.0 | 1,259.8 |
Worldwide Total [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,728.2 | 1,656.9 | 1,493.8
Total operating income | 330.5 | 322.6 | 54.6
Total Identifiable Assets | 2,040.4 | 2,044.5 |
North America [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,348.8 | 1,238.5 | $ 1,094.6
Total Identifiable Assets | $ 925.1 | $ 956.4 |

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