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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2018 USD ($) Customer | Mar. 31, 2017 USD ($) Customer | Mar. 31, 2016 Customer
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Maturities of short term investment interest-bearing securities | 90 days |  |
Accounts receivable due period | 30 days |  |
Unbilled account receivables | $ 15,131,000 | $ 14,579,000 |
Capitalized software development costs | 27,679,000 | 25,721,000 |
Accumulated amortization of software development costs | 88,567,000 | 78,952,000 |
Impairment of goodwill, intangible assets or other long-lived assets | 0 |  |
Goodwill | 36,814,000 | 36,814,000 |
Accumulated amortization of goodwill | $ 2,069,000 | $ 2,069,000 |
Computer Software Property and Equipment [Member] |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization period of computer software | 5 years |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Maximum customer risk percentage | 10.00% | 10.00% | 10.00%
Number of customer | Customer | 0 | 0 | 0
Credit Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Maximum customer risk percentage | 10.00% | 10.00% |
Number of customer | Customer | 0 | 0 |
Private Equity Funds [Member] |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Investment | $ 2,250,000 |  |
Reduction to investments | 1,169,000 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Transfer of assets | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Transfer of assets | $ 0 |  |

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