Number of stock option plans.

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

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

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

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

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

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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

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

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-Glossary Diluted Earnings Per Share

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-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

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-Name Accounting Standards Codification

-Topic 260

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-Subparagraph (c)

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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.

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

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No definition available.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Publisher FASB

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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

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

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

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-Subparagraph (c)(2)(iii)(2)

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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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- 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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-Name Accounting Standards Codification

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-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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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

Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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- Definition

Amount of stock repurchase plan authorized.

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

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-Name Accounting Standards Codification

-Topic 505

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-Name Regulation S-X (SX)

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Stockholders' Equity - Additional Information (Detail)	3 Months Ended		12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Jul. 31, 2015 USD ($) OptionPlan shares	Jul. 31, 2014 USD ($) 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 \| $	$ 17,000,000	$ 13,800,000
Intrinsic value of stock exercisable \| $	17,000,000	12,200,000
Intrinsic value of stock exercised \| $	1,400,000	1,000,000
Unrecognized compensation cost of outstanding options \| $	0
Stock-based compensation expense \| $	$ 1,545,000	$ 1,579,000
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		5,305
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		164,600
Stock units, forfeited	46,663
RSUs \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		159,600
RSUs \| Non-Executive Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	163,984
RSUs \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		5,000
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded	104,000
Stock units, forfeited	19,250
Share based payment award percentage of award achieved	173.30%
PSUs \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested	180,231
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	245,594	164,600
Stock units, forfeited	65,913	3,699
Stock units, vested	274,143	117,004
Stock-based compensation expense \| $	$ 1,400,000	$ 1,300,000
Value of shares issued for vested awards \| $	$ 4,500,000	$ 1,600,000
Weighted average remaining contractual term	1 year 9 months 18 days
Unrecognized compensation cost related to unvested RSUs and PSUs \| $	$ 8,100,000
RSUs and PSUs \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested	274,143	117,004