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Operating Segment Information and Concentrations of Risk - Summary of Geographical Information (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 Identifiable Assets | 4,032.6 | 2,351.0 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 2,345.7 | 1,459.9 |
General Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 1,686.9 | 891.1 |
North America |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,691.5 | 1,592.8 | 1,509.9
North America | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 1,294.6 | 1,103.6 |
Australia |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 315.1 | 301.1 | 252.5
Australia | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 235.4 | 242.6 |
Germany |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 137.1 | 2.1 | 2.7
Germany | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 512.3 | 0.5 |
New Zealand |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 79.1 | 76.8 | 73.3
New Zealand | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 39.2 | 34.8 |
Other Countries |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 283.8 | 81.7 | $ 83.2
Other Countries | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | $ 264.2 | $ 78.4 |

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