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Operating Segment Information and Concentrations of Risk - Summary of Geographical Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,921.6 | $ 1,728.2 | $ 1,656.9
Total Identifiable Assets | 2,012.7 | 2,029.4 |
General Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 718.9 | 774.4 |
Worldwide Total [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,921.6 | 1,728.2 | 1,656.9
Total Identifiable Assets | 2,012.7 | 2,029.4 |
Segments Total [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Identifiable Assets | 1,293.8 | 1,255.0 |
North America [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,509.9 | 1,348.8 | 1,238.5
Total Identifiable Assets | 953.1 | 925.1 |
Australia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 252.5 | 228.4 | 267.7
Total Identifiable Assets | 237.0 | 232.4 |
New Zealand [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 73.3 | 61.4 | 64.7
Total Identifiable Assets | 31.8 | 26.5 |
Other Countries [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 85.9 | 89.6 | $ 86.0
Total Identifiable Assets | $ 71.9 | $ 71.0 |

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