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Stock-Based Compensation - Summary of Stock Options Activity (Detail) - $ / shares | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Stock options granted in period (in shares) | 0 |  | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Outstanding Options, Number, Beginning balance (in shares) | 0 | 48,896 |
Exercised, Outstanding Options, Number (in shares) | 0 | (48,896) |
Outstanding Options, Number, Ending balance (in shares) | 0 | 0 | 48,896
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |
Outstanding Options, Weighted Average Exercise Price, Beginning balance (in dollars per share) |  | $ 6.38 |
Exercised, Outstanding Options, Weighted Average Exercise Price (in dollars per share) |  | $ 6.38 |
Outstanding Options, Weighted Average Exercise Price, Ending balance (in dollars per share) |  |  | $ 6.38

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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