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Income Taxes - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 AUD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 AUD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 AUD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 AUD ($) | Mar. 31, 2017 USD ($)
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized tax deduction |  | $ 86,200,000 | $ 126.4 |  |  |  |  |  |  |
Contribution to AICF |  | 108,900,000 | $ 156.7 | $ 103,000,000.0 | $ 138.4 | $ 102,200,000 | $ 135.1 | $ 468,000,000.0 | $ 632.0 |
Foreign tax credit carry-forwards | $ 114,200,000 | 114,200,000 |  | 115,500,000 |  |  |  | 114,200,000 |  |
Income taxes payable | 30,200,000 | 30,200,000 |  |  |  |  |  | 30,200,000 |  |
Prepaid Taxes | 85,500,000 | 85,500,000 |  |  |  |  |  | 85,500,000 |  |
Income tax paid, net of refunds |  | 52,500,000 |  |  |  |  |  |  |  |
Estimated refund | 87,600,000 | 87,600,000 |  |  |  |  |  | 87,600,000 |  |
Income taxes receivable | 84,700,000 | 84,700,000 |  |  |  |  |  | 84,700,000 |  |
Deferred deemed repatriation tax | 2,900,000 |  |  |  |  |  |  |  |  |
Income tax benefit | 25,500,000 | (46,500,000) |  | (71,800,000) |  | (28,200,000) |  |  |  |
Total amount of unrecognized tax benefits | 700,000 | 700,000 |  | 600,000 |  | 700,000 |  | 700,000 |  | $ 700,000
Interest and penalties accrued | 100,000 | 100,000 |  | 100,000 |  | 0 |  | 100,000 |  | $ 0
Interest and penalties recognized income tax expense |  | $ 0 |  | $ 100,000 |  | $ 0 |  |  |  |
Period for the amount of unrecognized tax benefits increase or decrease |  | next twelve months | next twelve months |  |  |  |  |  |  |
Foreign Tax Credit Carry-Forwards [Member] |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign tax credit carry-forwards | 112,400,000 | $ 112,400,000 |  |  |  |  |  | 112,400,000 |  |
Research tax credit carry-forwards | $ 1,800,000 | $ 1,800,000 |  |  |  |  |  | $ 1,800,000 |  |
Percentage of valuation allowance against loss carry-forwards (as percent) | 100.00% | 100.00% |  |  |  |  |  | 100.00% |  |
North America |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Tax loss carry-forwards | $ 41,300,000 | $ 41,300,000 |  |  |  |  |  | $ 41,300,000 |  |
Europe [Member] |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Tax loss carry-forwards | $ 2,300,000 | $ 2,300,000 |  |  |  |  |  | $ 2,300,000 |  |

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- Definition Under the terms of the Amended and Restated Final Funding Agreement (AFFA), a wholly owned Australian subsidiary (the Performing Subsidiary) has an obligation to make payments to the AICF on an annual basis. The amount of these annual payments is dependent on several factors, including the Company's free cash flow (as defined by the AFFA), actuarial estimations, actual claims paid, operating expenses of the AICF and the annual cash flow cap. + References No definition available. + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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