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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Oct. 01, 2019 | Mar. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Advertising expenses |  | $ 9,560,000 | $ 5,579,000 | $ 4,678,000 |  |
Net foreign currency transaction gain (loss) |  | (1,918,000) | 355,000 | 984,000 |  |
Asset retirement obligation |  | 780,000 | 1,420,000 |  |  |
Net carrying value |  | $ 0 |  |  |  |
Software updates and customer support costs amortization period |  | 5 years |  |  |  |
Total stockholders’ equity |  | $ 394,034,000 | 411,904,000 | $ 391,303,000 |  | $ 404,064,000
Hedvig, Inc. |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Contingent consideration (up to) |  | 8,000,000 |  |  | $ 8,000,000 |
Developed technology |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, useful life (in years) | 5 years |  |  |  |  |
Net carrying value |  | 0 |  |  |  |
Customer relationships |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, useful life (in years) | 2 years |  |  |  |  |
Net carrying value |  | $ 0 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Total stockholders’ equity |  |  | $ (84,000) |  |  |
Minimum | Buildings |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, depreciation period (in years) |  | 10 years |  |  |  |
Minimum | Computers, servers and other equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, depreciation period (in years) |  | 18 months |  |  |  |
Minimum | Furniture and fixtures |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, depreciation period (in years) |  | 3 years |  |  |  |
Maximum | Buildings |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, depreciation period (in years) |  | 60 years |  |  |  |
Maximum | Computers, servers and other equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, depreciation period (in years) |  | 3 years |  |  |  |
Maximum | Furniture and fixtures |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, depreciation period (in years) |  | 12 years |  |  |  |
Arrow | Revenue |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration percentage |  | 36.00% | 37.00% | 38.00% |  |
Customer concentration risk | Arrow | Accounts receivable |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration percentage |  | 33.00% | 31.00% |  |  |

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