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Operating Segment Information and Concentrations of Risk - Summary of Operating Segments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 2,506.6 | $ 2,054.5 | $ 1,921.6
Total operating income | 351.6 | 229.2 | 393.2
Net interest expense | (50.1) | (29.5) | (27.5)
Loss on early debt extinguishment | (1.0) | (26.1) | 0.0
Other income | 0.1 | 0.7 | 1.3
Income before income taxes | 300.6 | 174.3 | 367.0
Total Identifiable Assets | 4,032.6 | 2,351.0 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | 432.4 | 453.9 | 406.8
Total Identifiable Assets | 2,345.7 | 1,459.9 |
General Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (80.8) | (224.7) | (13.6)
Total Identifiable Assets | 1,686.9 | 891.1 |
North America Fiber Cement |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,676.9 | 1,578.1 | 1,493.4
North America Fiber Cement | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | 382.5 | 381.9 | 343.9
Total Identifiable Assets | 1,280.2 | 1,070.7 |
International Fiber Cement | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 328.8 | 328.8 |
Asia Pacific Fiber Cement |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 446.8 | 425.4 | 370.6
Asia Pacific Fiber Cement | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | 99.8 | 108.1 | 93.8
Europe Building Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 368.3 | 36.3 | 41.2
Europe Building Products | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | 10.0 | 0.3 | 1.3
Total Identifiable Assets | 717.7 | 22.8 |
Other Businesses |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 14.6 | 14.7 | 16.4
Other Businesses | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (30.9) | (8.6) | (6.7)
Total Identifiable Assets | 10.9 | 30.1 |
Research and Development | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (29.0) | (27.8) | $ (25.5)
Total Identifiable Assets | $ 8.1 | $ 7.5 |

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