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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Number of options |  |  |  |
Number of Options outstanding, Beginning Balance | 545,590 | 451,668 | 210,297 |
Number of Options, Granted | 192,700 | 169,703 | 242,068 |
Number of Options, Exercised | (171,630) | (62,197) | (263) |
Number of Options, Forfeited | (11,754) | (11,495) |  |
Number of Options, Expired |  | 2,089 | 434 |
Number of Options outstanding, Ending Balance | 554,906 | 545,590 | 451,668 | 210,297
Number of Options, Exerciseable | 186,823 |  |  |
Number of Options, Vested and Expected to Vest | 545,299 |  |  |
Options outstanding, Weighted Average Remaining Contract Term |  |  |  |
Options outstanding, Weighted Average Remaining Contract Term (Years) | 8 years | 8 years 4 months 24 days | 8 years 4 months 24 days | 8 years 6 months
Options exercisable, Weighted Average Remaining Contract Term (Years) | 6 years 10 months 24 days |  |  |
Options vested and expected to vest, Weighted Average Remaining Contract Term (Years) | 8 years |  |  |
Weighted average exercise price |  |  |  |
Options outstanding, Weighted Average Exercise Price, Beginning Balance | $ 68.65 | $ 62.29 | $ 67.54 |
Weighted Average Exercise Price, Granted | 75.17 | 83.14 | 57.60 |
Weighted Average Exercise Price, Exercised | 63.66 | 63.44 | 18.25 |
Weighted Average Exercise Price, Expired | 75.17 | 70.22 |  |
Weighted Average Exercise Price, Forfeited |  | 18.25 | 18.25 |
Options outstanding, Weighted Average Exercise Price, Ending Balance | 72.31 | $ 68.65 | $ 62.29 | $ 67.54
Options exercisable, Weighted Average Exercise Price | 69.34 |  |  |
Weighted Average Exercise Price, Vested and Expected to Vest | $ 72.24 |  |  |
Aggregate intrinsic value |  |  |  |
Options outstanding, Aggregate Intrinsic Value, Beginning Balance | $ 2,679 | $ 7,520 | $ 218 |
Options exercised, aggregate intrinsic value | 2,707 | 1,132 | 12 |
Options forfeited, aggregate intrinsic value | 0 | 75 |  |
Options expired, aggregate intrinsic value |  | 137 | 15 |
Options outstanding, Aggregate Intrinsic Value, Ending Balance | 1,040 | $ 2,679 | $ 7,520 | $ 218
Options exercisable, Aggregate Intrinsic Value | 452 |  |  |
Options vested and expected to vest, aggregate intrinsic value | $ 1,038 |  |  |

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 + 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 Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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