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Operating Segment Information and Concentrations of Risk - Summary of Geographical Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 2,606.8 | $ 2,506.6 | $ 2,054.5
Total Identifiable Assets | 4,028.3 | 4,032.6 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 2,391.4 | 2,345.7 |
General Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 1,636.9 | 1,686.9 |
North America |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,817.0 | 1,691.5 | 1,592.8
North America | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 1,324.8 | 1,294.6 |
Australia |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 290.4 | 315.1 | 301.1
Australia | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 220.0 | 235.4 |
Germany |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 135.7 | 137.1 | 2.1
Germany | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 519.3 | 512.3 |
New Zealand |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 72.2 | 79.1 | 76.8
New Zealand | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 32.4 | 39.2 |
Other Countries |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 291.5 | 283.8 | $ 81.7
Other Countries | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | $ 294.9 | $ 264.2 |

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