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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax [Line Items] |  |  |  |
Increased in valuation allowance against deferred tax assets |  | $ 2.2 |  |
Increase related to prior tax positions |  | 4.2 |  |
Accrued interest on uncertain tax position |  | 0.0 | $ 0.0 | $ 0.0
Accrued penalties on uncertain tax position |  | $ 0.0 | 0.0 | $ 0.0
Federal corporate tax rate | 35.00% | 21.00% |  |
Deductibility percentage of certain capital expenditures |  | 100.00% |  |
Tax benefit from change in corporate tax rates on deferred tax liabilities | $ 61.7 |  |  |
Income tax benefit carryback under CARES Act |  | $ 35.9 |  |
Net operating losses carryback term due to CARES Act |  | 5 years |  |
Income tax benefit partially offset created by CARES Act |  | $ 4.2 |  |
State Income Tax [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards |  | 5.4 | 1.0 |
State Income Tax [Member] | Research and Development (R&D) [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Income tax credit |  | $ 2.2 | $ 2.0 |
Tax credit carryforward term |  | 20 years |  |

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