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Income Taxes - Additional Information (Detail) $ in Millions | 12 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2019 AUD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 AUD ($) | Apr. 01, 2018 USD ($) | Mar. 31, 2016 USD ($)
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Deferred income taxes | $ 1,092,900,000 |  | $ 29,900,000 |  | $ 1,092,900,000 |  |  |
Recognized tax deduction | 86,900,000 | $ 119.1 |  |  |  |  |  |
Contribution to AICF | 103,000,000 |  | 102,200,000 | $ 91,100,000 | 472,100,000 | $ 595.3 |  |
Foreign tax credit carry-forwards | 115,500,000 |  | 126,100,000 |  | 115,500,000 |  |  |
Income taxes payable | 38,600,000 |  |  |  | 38,600,000 |  |  |
Income tax paid, net of refunds | 26,300,000 |  |  |  |  |  |  |
Total amount of unrecognized tax benefits | 600,000 |  | 700,000 | 700,000 | 600,000 |  |  | $ 700,000
Interest and penalties accrued | 100,000.0 |  | 0 | 0 | 100,000.0 |  |  | $ 0
Interest and penalties recognized income tax expense | $ 100,000.0 |  | 0 | $ 0 |  |  |  |
Period for the amount of unrecognized tax benefits increase or decrease | next twelve months | next twelve months |  |  |  |  |  |
Deferred tax assets, valuation allowance | $ 267,600,000 |  | 129,600,000 |  | 267,600,000 |  |  |
Other assets | 2,900,000 |  | $ 4,700,000 |  | 2,900,000 |  |  |
Foreign Tax Credit Carry-Forwards [Member] |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Foreign tax credit carry-forwards | 114,600,000 |  |  |  | 114,600,000 |  |  |
Research tax credit carry-forwards | $ 900,000 |  |  |  | $ 900,000 |  |  |
Percentage of valuation allowance against loss carry-forwards (as percent) | 100.00% |  |  |  | 100.00% |  |  |
Australia |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carry-forwards | $ 23,700,000 |  |  |  | $ 23,700,000 |  |  |
North America |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carry-forwards | 37,000,000 |  |  |  | 37,000,000 |  |  |
Europe [Member] |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carry-forwards | 9,200,000 |  |  |  | 9,200,000 |  |  |
Tax loss carry-forwards available to offset future taxable income not subject to expiration | 5,700,000 |  |  |  | 5,700,000 |  |  |
Operating loss carry-forwards subject to expiration | $ 3,500,000 |  |  |  | $ 3,500,000 |  |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  | $ 1,313,000,000 |
Deferred tax assets, valuation allowance |  |  |  |  |  |  | 148,200,000 |
Other assets |  |  |  |  |  |  | $ 4,500,000 |

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