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Stockholders' Equity - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2020 USD ($) shares | Jan. 31, 2019 USD ($) shares | Jan. 31, 2020 USD ($) OptionPlan shares | Jan. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Antidilutive shares of common stock excluded from computation of diluted earnings per share | 20,664 |  |  |
Number of incentive stock plans | OptionPlan |  |  | 2 |
Intrinsic value of stock outstanding | $ | $ 571,000 | $ 1,500,000 | $ 571,000 | $ 1,500,000
Intrinsic value of stock exercisable | $ | 571,000 | $ 1,500,000 | 571,000 | 1,500,000
Intrinsic value of stock exercised | $ |  |  | 100,000 | $ 230,000
Unrecognized compensation expense relating to outstanding stock options | $ | $ 0 |  | $ 0 |
Stock options exercised | 0 | 0 | 15,000 | 32,899
Stock-based compensation expense | $ |  |  | $ 1,400,000 | $ 6,100,000
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 |  |  | 255,911 | 192,085
Grant date fair value of vested RSUs and PSUs | $ |  |  | $ 2,200,000 | $ 2,400,000
Stock units, forfeited |  |  | 236,319 | 25,453
RSUs | Non-Executive Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units, awarded |  |  | 140,271 | 142,576
RSUs | Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units, awarded |  |  | 115,640 | 49,509
Service based PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units, forfeited |  |  | 210,300 |
RSUs and PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ |  |  | $ 789,000 | $ 5,800,000
Stock units, awarded |  |  | 255,911 | 192,085
Stock units, forfeited |  |  | 603,344 | 137,453
Unrecognized compensation expense related to unvested RSUs and PSUs | $ | $ 3,100,000 |  | $ 3,100,000 |
Weighted average remaining contractual term |  |  | 1 year 3 months 18 days |
Performance based PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units, forfeited |  |  | 156,725 |
PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units, forfeited |  |  |  | 112,000
2013 Incentive Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option, exercisable period |  |  | 10 years |
2013 Incentive Stock Plan | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
2013 Incentive Stock Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 4 years |

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