The highest aggregate amount that may be paid in cash to a participant as a performance-based award per period.

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- Definition

The highest aggregate number of shares with respect to one or more awards that may be granted to a participant under the plan per period.

+ 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.

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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

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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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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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

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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Stock-Based Compensation (Details) - USD ($)	12 Months Ended
Stock-Based Compensation (Details) - USD ($)	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Stock Based Compensation
Stock based compensation expense	$ 6,985,000	$ 4,956,000	$ 3,392,000
Restated 2006 Plan
Stock Based Compensation
Maximum number of shares that may be granted to one participant during any twelve month period	2,000,000
Maximum amount that may be paid in cash as a performance-based award to one participant during any twelve month period	$ 5,000,000
Restated 2006 Plan \| Maximum
Stock Based Compensation
Number of shares authorized to be issued pursuant to awards	4,884,157
Restated 2006 Plan \| Incentive stock options \| Minimum
Stock Based Compensation
Percentage of the fair market value on date of grant	100.00%
2002 Plan \| Stock options
Stock Based Compensation
Exercisable period from grant date	5 years
Number of awards that may be granted	0
1992 Plan \| Stock options
Stock Based Compensation
Exercisable period from grant date	5 years
Fiscal 2018 LTIP \| Performance based restricted stock units
Stock Based Compensation
Stock based compensation expense	$ 588,000	269,000
Fiscal 2018 LTIP \| Performance based restricted stock units \| Maximum
Stock Based Compensation
Stock based compensation expense	2,275,000
Fiscal 2017 LTIP \| Performance based restricted stock units
Stock Based Compensation
Stock based compensation expense	$ 301,000	$ 159,000