Income Taxes - Additional Information (Detail) $ in Millions |
3 Months Ended | 12 Months Ended | 60 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2020
USD ($)
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Mar. 31, 2020
USD ($)
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Mar. 31, 2020
AUD ($)
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Mar. 31, 2019
USD ($)
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Mar. 31, 2019
AUD ($)
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Mar. 31, 2018
USD ($)
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Mar. 31, 2018
AUD ($)
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Mar. 31, 2020
USD ($)
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Mar. 31, 2020
AUD ($)
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Mar. 31, 2017
USD ($)
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| 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 | |||||||
| X | ||||||||||
- Definition The tax deduction relating to the AICF contribution. No definition available.
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| X | ||||||||||
- 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. No definition available.
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| X | ||||||||||
- Definition Percentage of valuation allowance against loss carry forwards. No definition available.
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition This element provides a description of the nature of the event that could occur within twelve months of the reporting date that would cause a significant increase or decrease in the related unrecognized tax benefit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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