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Commitments and Contingencies (Details) - claim | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of pending claims | 359 | 365 | 360 | 393 | 332 | 336
New Zealand | Subsidiaries | New Zealand Weathertightness |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of pending claims | 1 |  |  |  |  |

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