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Stockholders' Equity - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) OptionPlan shares | Apr. 30, 2017 USD ($) shares | Apr. 30, 2016 USD ($) shares | Jun. 30, 2015 USD ($) | Sep. 23, 2013 shares | Sep. 26, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchase authorization | $ |  |  |  | $ 50,000,000 |  |
Repurchase of common stock | 0 | 2,600,000 |  |  |  |
Number of stock incentive plans | OptionPlan | 2 |  |  |  |  |
Intrinsic value of stock outstanding | $ | $ 1,400,000 | $ 5,200,000 | $ 6,100,000 |  |  |
Intrinsic value of stock exercisable | $ | 1,400,000 | 5,200,000 | 6,100,000 |  |  |
Intrinsic value of stock exercised | $ | 116,000 | 1,300,000 | 27,200,000 |  |  |
Unrecognized compensation cost of outstanding options | $ | $ 0 |  |  |  |  |
Performance period | 3 years |  |  |  |  |
Percentage of maximum aggregate award granted | 200.00% |  |  |  |  |
Percentage of stock outperform in order for target award to vest | 5.00% |  |  |  |  |
Stock-based compensation expense | $ | $ 7,815,000 | 8,590,000 | 6,472,000 |  |  |
Grant date fair value of vested RSUs and PSUs | $ | $ 5,000,000 | $ 5,000,000 | $ 4,600,000 |  |  |
2011 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Option exercise price per share as a percentage of fair market value | 85.00% |  |  |  |  |
Number of shares an employee may purchase under the stock purchase plan | 12,500 |  |  |  |  |
Fair market value of shares an employee may purchase under the stock purchase plan | $ | $ 25,000 |  |  |  |  |
Shares issued under employee stock purchase plan | 203,002 | 144,102 | 157,674 |  |  |
PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance period | 3 years |  |  |  |  |
Stock units, awarded | 105,000 | 118,500 | 104,000 |  |  |
Share based payment award percentage of award achieved | 115.20% | 200.00% | 173.30% |  |  |
Stock units, forfeited | 39,429 |  | 19,250 |  |  |
RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded | 388,186 | 394,909 | 321,692 |  |  |
Stock units, forfeited | 208,496 | 19,448 | 66,185 |  |  |
RSUs and PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded | 561,890 | 666,509 | 541,077 |  |  |
Stock units, vested | 300,496 | 433,966 | 430,768 |  |  |
Stock units, forfeited | 247,925 | 19,448 | 85,435 |  |  |
Grant date fair value of vested RSUs and PSUs | $ | $ 6,200,000 | $ 11,700,000 | $ 7,800,000 |  |  |
Unrecognized compensation cost related to unvested RSUs and PSUs | $ | $ 9,600,000 |  |  |  |  |
Weighted average remaining contractual term | 1 year 9 months 18 days |  |  |  |  |
Executive Officer | PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded | 157,700 | 153,100 | 137,775 |  |  |
Stock units, vested | 121,504 | 237,000 | 180,231 |  |  |
Executive Officer | RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded | 159,167 | 168,800 | 117,100 |  |  |
Director | RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded | 52,826 | 24,896 | 36,379 |  |  |
Non-Executive Employees | PSUs | Without Market Conditions |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  |  | 5,379 |  |  |
Non-Executive Employees | RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded | 176,193 | 201,213 | 168,213 |  |  |
Employees And Consultants | RSUs and PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ | $ 7,100,000 | $ 7,800,000 | $ 5,900,000 |  |  |
Employees | RSUs and PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, vested | 300,496 | 433,966 | 430,768 |  |  |
2013 Incentive Stock Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized of common stock |  |  |  |  | 3,000,000 |
Stock option, exercisable period | 10 years |  |  |  |  |
Shares available for grant under incentive stock option | 4,746,149 |  |  |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchase authorization | $ |  | $ 50,000,000 |  |  |  |
Payroll deduction of participant's compensation | 20.00% |  |  |  |  |
Maximum | 2011 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved under employee stock purchase plan |  |  |  |  |  | 6,000,000
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 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payroll deduction of participant's compensation | 1.00% |  |  |  |  |
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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