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Stockholders' Equity - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 15, 2020 USD ($) shares | Jan. 31, 2021 USD ($) shares | Jan. 31, 2020 USD ($) shares | Jan. 31, 2021 USD ($) OptionPlan shares | Jan. 31, 2020 USD ($) shares | Mar. 02, 2021 USD ($) | Apr. 30, 2020 shares | Apr. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program Completion date | Jan. 31, 2021 |  |  |  |  |  |  |
Antidilutive shares excluded from computation of diluted earnings per share |  | 14,994 | 20,664 | 16,724 | 24,843 |  |  |
Number of stock incentive plans | OptionPlan |  |  |  | 2 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 0 | 92,094 | 0 | 92,094 |  | 200,667 | 267,761
Intrinsic value of stock outstanding | $ |  |  | $ 571,000 |  | $ 571,000 |  |  |
Intrinsic value of stock exercisable | $ |  |  | 571,000 |  | 571,000 |  |  |
Intrinsic value of stock exercised | $ |  | $ 151,000 | 100,000 | $ 2,900,000 | 100,000 |  |  |
Unrecognized compensation expense relating to outstanding stock options | $ |  | $ 0 | 0 | 0 | 0 |  |  |
Stock-based compensation expense | $ |  |  |  | $ 3,400,000 | $ 941,000 |  |  |
Performance period |  |  |  | 3 years |  |  |  |
RSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |  |
Vesting, percentage |  |  |  | 0.25% |  |  |  |
Stock units, awarded |  |  |  | 234,007 | 255,911 |  |  |
Grant date fair value of vested RSUs and PSUs | $ |  |  |  | $ 7,000,000.0 | $ 2,200,000 |  |  |
Stock units, forfeited |  |  |  | 88,219 | 236,319 |  |  |
RSUs | Non-Executive Employees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock units, awarded |  |  |  | 139,976 | 140,271 |  |  |
RSUs | Directors |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock units, awarded |  |  |  | 25,570 | 115,640 |  |  |
Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock units, forfeited |  |  |  | 92,500 | 156,725 |  |  |
Performance Shares | Executive Officers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock units, awarded |  |  |  | 36,308 |  |  |  |
Stock units, forfeited |  |  |  | 92,500 |  |  |  |
RSUs and PSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 2,600,000 | $ 789,000 |  |  |
Stock units, awarded |  |  |  | 270,315 | 255,911 |  |  |
Stock units, forfeited |  |  |  | 180,719 | 603,344 |  |  |
Unrecognized compensation expense related to unvested RSUs and PSUs | $ |  |  | $ 4,000,000.0 |  | $ 4,000,000.0 |  |  |
Weighted average remaining contractual term |  |  |  |  | 1 year 4 months 24 days |  |  |
Service based PSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock units, forfeited |  |  |  |  | 210,300 |  |  |
2013 Incentive Stock Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |  |
Stock option, exercisable period |  |  |  | 10 years |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased | 2,737,489 |  |  |  |  |  |  |
Cash on hand utilized for repurchase of shares | $ | $ 50,000,000.0 |  |  |  |  |  |  |
Common Stock | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Authorized repurchase amount | $ | $ 50,000,000.0 |  |  |  |  |  |  |
Common Stock | Maximum | Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Authorized repurchase amount | $ |  |  |  |  |  | $ 100,000,000.0 |  |

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