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Asbestos - Numbers of Open Claims, New Claims and Closed Claims and Average Settlement Per Settled Claim and Case Closed (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |  |
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Mar. 31, 2023 AUD ($) claim | Mar. 31, 2022 AUD ($) claim | Mar. 31, 2021 AUD ($) claim | Mar. 31, 2020 AUD ($) claim | Mar. 31, 2019 AUD ($) claim | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Loss Contingency, Pending Claims, Number [Roll Forward] |  |  |  |  |  |  |  |  |  |
Number of open claims at beginning of period | 365 | 360 | 393 | 332 | 336 |  |  |  |  |
Number of new claims, direct claims | 403 | 411 | 392 | 449 | 430 |  |  |  |  |
Number of new claims, cross claims | 152 | 144 | 153 | 208 | 138 |  |  |  |  |
Number of closed claims | 561 | 550 | 578 | 596 | 572 |  |  |  |  |
Number of open claims at end of period | 359 | 365 | 360 | 393 | 332 |  |  |  |  |
Average settlement amount per settled claim | $ 303 | $ 314 | $ 248 | $ 277 | $ 262 | $ 208 | $ 232 | $ 178 | $ 189 | $ 191
Average settlement amount per case closed 1 | $ 271 | $ 282 | $ 225 | $ 245 | $ 234 | $ 186 | $ 208 | $ 162 | $ 167 | $ 171

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