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Stockholders' Equity - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2018 USD ($) OptionPlan shares | Jul. 31, 2017 USD ($) shares | Apr. 30, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Repurchase of common stock | shares | 0 |  |
Number of stock incentive option plans | OptionPlan | 2 |  |
Intrinsic value of stock outstanding | $ | $ 853,000 | $ 4,700,000 |
Intrinsic value of stock exercisable | $ | 853,000 | $ 4,700,000 |
Intrinsic value of stock exercised | $ | $ 76,000 |  |
Proceeds from exercise of employee stock options (in shares) | shares | 17,399 | 0 |
Unrecognized compensation cost of outstanding stock options | $ | $ 0 |  |
Stock-based compensation expense | $ | $ 2,000,000 | $ 1,900,000 |
Performance period | 3 years |  |
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grant date fair value of vested RSUs and PSUs | $ | $ 1,700,000 |  |
Stock units, forfeited | shares | 6,180 |  |
PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock units, awarded | shares |  | 105,500 |
Stock units, forfeited | shares | 112,000 |  |
Share based payment award percentage of award achieved |  | 115.20% |
RSUs and PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ | $ 1,800,000 | $ 1,700,000 |
Stock units, awarded | shares | 140,771 | 180,184 |
Grant date fair value of vested RSUs and PSUs | $ |  | $ 1,700,000 |
Stock units, forfeited | shares | 118,180 | 92,902 |
Stock units, vested | shares | 146,523 | 247,491 |
Unrecognized compensation cost related to unvested RSUs and PSUs | $ | $ 9,300,000 |  |
Weighted average remaining contractual term | 1 year 9 months 18 days |  |
Non-Executive Employees | RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock units, awarded | shares | 140,771 | 164,180 |
Executive Officer | PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock units, vested | shares |  | 121,504 |
2013 Incentive Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option, exercisable period | 10 years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock repurchase authorization | $ |  |  | $ 50,000,000
Maximum | 2013 Incentive Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period to award vested and calculate volatility rate | 4 years |  |
Minimum | 2013 Incentive Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period to award vested and calculate volatility rate | 3 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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