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.

+ Details

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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.

+ Details

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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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- 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

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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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- Definition

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

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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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- 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).

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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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- 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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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.

+ References

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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
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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
-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Stockholders' Equity - Additional Information (Detail)	1 Months Ended	12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Mar. 31, 2017 USD ($) shares	Apr. 30, 2017 USD ($) OptionPlan shares	Apr. 30, 2016 USD ($) shares	Apr. 30, 2015 USD ($) shares	Mar. 27, 2017 USD ($)	Sep. 23, 2013 shares	Sep. 26, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock	2,604,240
Repurchase shares value \| $	$ 50,000,000	$ 50,052,000		$ 30,040,000
Number of stock option plans \| OptionPlan		2
Intrinsic value of stock outstanding \| $		$ 5,200,000	$ 6,100,000	16,100,000
Intrinsic value of stock exercisable \| $		5,200,000	6,100,000	16,000,000
Intrinsic value of stock exercised \| $		1,300,000	$ 27,200,000	$ 2,900,000
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%	5.00%	5.00%
Stock-based compensation expense \| $		$ 8,590,000	$ 6,472,000	$ 5,808,000
Grant date fair value of vested RSUs and PSUs \| $		$ 5,000,000	$ 4,600,000	$ 4,000,000
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		144,102	157,674	161,456
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years
Stock units, awarded		118,500	104,000	46,600
Share based payment award percentage of award achieved		200.00%	173.30%
Stock units, forfeited			19,250	41,250
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		394,909	321,692	554,933
Stock units, forfeited		19,448	66,185	57,752
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		666,509	541,077	709,672
Stock units, vested		433,966	430,768	433,266
Stock units, forfeited		19,448	85,435	101,002
Grant date fair value of vested RSUs and PSUs \| $		$ 11,700,000	$ 7,800,000	$ 5,400,000
Unrecognized compensation cost related to unvested RSUs and PSUs \| $		$ 12,400,000
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		153,100	137,775	112,000
Stock units, vested		237,000	180,231	93,200
Executive Officer \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		168,800	117,100	125,000
Director \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		24,896	36,379	46,639
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		201,213	168,213	379,433
Employees And Consultants \| RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 7,800,000	$ 5,900,000	$ 5,100,000
Employees \| RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested		433,966	430,768	433,266
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		4,954,883
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorization \| $			$ 50,000,000		$ 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