Employee stock purchase plan payroll deductions percent.

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- Definition

Number of stock option plans.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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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.

+ References

No definition available.

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- Definition

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

+ References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (i)
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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.

+ References

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 40
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-Paragraph 1
-Subparagraph (f)
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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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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (a)(1)
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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.

+ References

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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Balance Type:	credit
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Stockholders' Equity - Additional Information (Detail)	12 Months Ended
Stockholders' Equity - Additional Information (Detail)	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