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Stockholders' Equity - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2015 USD ($) shares | Jan. 31, 2016 USD ($) OptionPlan shares | Jan. 31, 2015 USD ($) shares | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Senior Notes Indenture, number of shares allowed for repurchase | $ |  | $ 50,000,000 |  |  |  |
Repurchase of common stock |  | 0 |  |  |  |
Number of stock option plans | OptionPlan |  | 2 |  |  |  |
Intrinsic value of stock outstanding | $ | $ 12,700,000 | $ 19,200,000 | $ 12,700,000 |  |  |
Intrinsic value of stock exercisable | $ | $ 12,400,000 | 19,200,000 | 12,400,000 |  |  |
Intrinsic value of stock exercised | $ |  | 9,100,000 | $ 1,700,000 |  |  |
Unrecognized compensation cost of outstanding options | $ |  | $ 0 |  |  |  |
Shares issued under employee stock purchase plan |  | 92,249 | 84,081 |  |  |
Stock-based compensation expense | $ |  | $ 4,885,000 | $ 4,249,000 |  |  |
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% | 10.00% | 10.00%
2013 Incentive Stock Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Period of award vested exercisable |  | 10 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 |  |  |  |
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 |  |  |  |
2011 ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock issuable with antidilutive effect | 134,866 |  | 70,978 |  |  |
RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  |  | 452,600 |  |  |
RSUs | Without Market Conditions |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  | 201,242 |  |  |  |
RSUs | Non-Executive Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  | 170,826 |  |  |  |
RSUs | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  | 30,416 | 50,500 |  |  |
RSUs | Executive Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  |  | 25,000 |  |  |
PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  | 104,000 | 46,600 |  |  |
Share based payment award percentage of award achieved |  | 173.30% |  |  |  |
PSUs | Without Market Conditions |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  | 5,379 |  |  |  |
PSUs | Executive Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, vested |  | 180,231 | 93,200 |  |  |
PSUs | Non-Executive Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  | 5,379 |  |  |  |
RSUs and PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock units, awarded |  | 282,852 | 499,200 |  |  |
Stock units, vested |  | 363,285 | 318,171 |  |  |
Stock-based compensation expense | $ |  | $ 4,500,000 | $ 3,700,000 |  |  |
Value of shares issued for vested awards | $ |  | $ 6,300,000 | $ 3,700,000 |  |  |
Weighted average remaining contractual term |  | 1 year 4 months 24 days |  |  |  |
Unrecognized compensation cost related to unvested RSUs and PSUs | $ |  | $ 5,800,000 |  |  |  |

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