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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Income Tax [Line Items] |  |  |
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
Income tax benefit carryback under CARES Act |  | $ 35.9 |
Net operating losses carryback term due to CARES Act |  | 5 years |
State Income Tax [Member] |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carryforwards | 3.7 | $ 5.4 |
State Income Tax [Member] | Research and Development (R&D) [Member] |  |  |
Income Tax [Line Items] |  |  |
Income tax credit | $ 1.1 | $ 2.2 |
Tax credit carryforward term | 20 years |  |

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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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