Employee stock purchase plan payroll deductions percent.

No definition available.

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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

Stock repurchase program fees and expenses related to tender offer and open market purchases.

+ 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
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-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
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-Section F

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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.

+ References

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

+ References

No definition available.

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Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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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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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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- 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.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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-Section 50
-Paragraph 2
-Subparagraph (d)(2)
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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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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

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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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
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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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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-Publisher FASB
-Name Accounting Standards Codification
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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-Name Accounting Standards Codification
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Stockholders' Equity - Additional Information (Detail)	12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Apr. 30, 2016 USD ($) OptionPlan shares	Apr. 30, 2015 USD ($) shares	Apr. 30, 2014 USD ($) shares	May 01, 2014 USD ($)	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		$ 115,000,000	$ 30,000,000
Repurchase of common stock	0	2,105,315
Fees and expenses incurred related to tender offer and open market purchases \| $		$ 40,000	887,000
Repurchase shares value \| $		30,040,000	115,887,000
Number of stock option plans \| OptionPlan	2
Intrinsic value of stock outstanding \| $	$ 6,100,000	16,100,000	20,800,000
Intrinsic value of stock exercisable \| $	6,100,000	16,000,000	17,000,000
Intrinsic value of stock exercised \| $	27,200,000	2,900,000	7,300,000
Unrecognized compensation cost of outstanding options \| $	0
Stock-based compensation expense \| $	$ 6,472,000	$ 5,808,000	$ 8,212,000
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%	5.00%	10.00%
Grant date fair value of vested RSUs and PSUs \| $	$ 4,600,000	$ 4,000,000	$ 4,000,000
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Stock units, awarded	104,000
Share based payment award percentage of award achieved	173.30%
Stock Units, Forfeited	19,250	41,250	9,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	321,692	554,933	565,556
Stock Units, Forfeited	66,185	57,752	17,316
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $			$ 6,400,000
Stock units, awarded	541,077	709,672	718,056
Stock units, vested	430,768	433,266	457,851
Stock Units, Forfeited	85,435	101,002	26,316
Grant date fair value of vested RSUs and PSUs \| $	$ 7,800,000	$ 5,400,000	$ 5,700,000
Unrecognized compensation cost related to unvested RSUs and PSUs \| $	$ 9,000,000
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	137,775	112,000	117,500
Stock units, vested	180,231		30,000
Executive Officer \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	117,100	125,000	351,400
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	168,213	379,433	164,918
Director \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	36,379	46,639	42,238
Employees And Consultants \| RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $	$ 5,900,000	$ 5,100,000
Employees \| PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested		93,200
Employees \| RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested	430,768	433,266	457,851
Consultant \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		46,600	7,000
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	157,674	161,456	176,204
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deduction of participant's compensation	1.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
2013 Incentive Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized of common stock					3,000,000
Period of award vested exercisable	10 years
Shares available for grant under incentive stock option	5,428,331
2013 Incentive Stock Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period to award vested and calculate volatility rate	3 years
2013 Incentive Stock Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period to award vested and calculate volatility rate	4 years
Tender Offer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorization \| $			$ 75,000,000
Repurchase of common stock			1,417,233
Repurchase shares value \| $			$ 15,600,000
Open Market
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock			8,740,471
Repurchase shares value \| $			$ 99,400,000