Employee stock purchase plan payroll deductions percent.

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- Definition

Number of stock option plans.

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- Definition

Percentage of stock outperform in order for target award to vest.

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- Definition

Share based compensation arrangement by share based payment award award exercisable period.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award percentage of award achieved.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award performance period.

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No definition available.

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- Definition

Share based compensation percentage of target award granted for calculating maximum aggregate award of performance share.

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No definition available.

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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.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

Fair value of the shares allocated that are subject to a repurchase obligation.

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- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Amount of stock repurchase plan authorized.

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No definition available.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Stockholders' Equity - Additional Information (Detail)	12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Apr. 30, 2019 USD ($) OptionPlan shares	Apr. 30, 2018 USD ($) shares	Apr. 30, 2017 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	0	2,600,000
Number of stock incentive plans \| OptionPlan	2
Intrinsic value of stock outstanding \| $	$ 826,000	$ 1,400,000	$ 5,200,000
Intrinsic value of stock exercisable \| $	826,000	1,400,000	5,200,000
Intrinsic value of stock exercised \| $	285,000	116,000	1,300,000
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 \| $	$ 7,992,000	7,815,000	8,590,000
Grant date fair value of vested RSUs and PSUs \| $	$ 3,900,000	5,000,000	$ 5,000,000
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	230,282	203,002	144,102
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Stock units, awarded		105,000	118,500
Stock units, forfeited	112,000	39,429
Share based payment award percentage of award achieved		115.20%	200.00%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	360,185	388,186	394,909
Stock units, forfeited	33,899	208,496	19,448
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	541,785	561,890	666,509
Stock units, forfeited	145,899	247,925	19,448
Stock units, vested	206,572	300,496	433,966
Grant date fair value of vested RSUs and PSUs \| $	$ 2,500,000	$ 6,200,000	$ 11,700,000
Unrecognized compensation cost related to unvested RSUs and PSUs \| $	$ 7,700,000
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	181,600	157,700	153,100
Stock units, vested		121,504	237,000
Executive Officer \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	167,818	159,167	168,800
Director \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	49,509	52,826	24,896
Non-Executive Employees \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	142,858	176,193	201,213
Employees And Consultants \| RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $	$ 7,300,000	$ 7,100,000	$ 7,800,000
Employees \| RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested	206,572	300,496	433,966
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	4,404,603
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