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Income Taxes - Additional Information (Detail) AUD in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 04, 2013 USD ($) | Nov. 04, 2013 AUD | Mar. 31, 2012 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2016 AUD | Mar. 31, 2015 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2016 AUD | Mar. 31, 2014 USD ($) | Mar. 31, 2013 USD ($)
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized tax deduction |  |  |  | $ 63.0 | AUD 85.5 |  |  |  |  |
Contribution to AICF |  |  |  | 62.8 |  | $ 113.0 | $ 411.4 | AUD 427.4 |  |
Foreign tax credit carry-forwards |  |  |  | 112.4 |  | 107.0 | 112.4 |  |  |
Income taxes payable, current |  |  |  | 4.8 |  | 1.8 | 4.8 |  |  |
Income tax paid, net of refunds |  |  |  | 57.8 |  |  |  |  |  |
Undistributed certain domestic subsidiary earnings |  |  |  | 200.0 |  |  | 200.0 |  |  |
Total amount of unrecognized tax benefits |  |  |  | 0.7 |  | 4.9 | 0.7 |  | $ 0.5 | $ 1.5
Interest and penalties recognized income tax expense |  |  |  | $ 0.3 |  | $ 0.3 |  |  |  |
Period for the amount of unrecognized tax benefits increase or decrease |  |  |  | Next twelve months | Next twelve months |  |  |  |  |
Australia [Member] |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Tax loss carry-forwards |  |  |  | $ 17.3 |  |  | 17.3 |  |  |
Foreign Tax Credit Carry-Forwards [Member] |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign tax credit carry-forwards |  |  |  | $ 112.4 |  |  | $ 112.4 |  |  |
Percentage of valuation allowance against loss carry-forwards |  |  |  | 100.00% |  |  | 100.00% |  |  |
Europe [Member] |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Tax loss carry-forwards |  |  |  | $ 6.8 |  |  | $ 6.8 |  |  |
Tax loss carry-forwards available to offset future taxable income not subject to expiration |  |  |  | 4.2 |  |  | 4.2 |  |  |
Reversal of valuation allowance |  |  |  | (4.2) |  |  |  |  |  |
Operating loss carry-forwards subject to expiration |  |  |  | $ 2.6 |  |  | $ 2.6 |  |  |
RCI [Member] |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate refund amended assessment |  |  | $ 396.3 |  |  |  |  |  |  |
Income tax benefit from RCI's successful appeal | $ 15.4 | AUD 17.3 |  |  |  |  |  |  |  |

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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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