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

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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.

+ Details

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

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-Publisher FASB
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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.

+ References

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- Definition

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

+ References

No definition available.

+ Details

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Stock-Based Compensation (Details) - USD ($)	12 Months Ended
Stock-Based Compensation (Details) - USD ($)	Apr. 30, 2020	Apr. 25, 2020	Apr. 30, 2019	Apr. 30, 2018
Stock Based Compensation
Stock based compensation expense	$ 6,227,000		$ 6,985,000	$ 4,956,000
Performance based restricted stock units \| Maximum
Stock Based Compensation
Stock based compensation expense	$ 4,263,000
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	$ 193,000		588,000	$ 269,000
Fiscal 2017 LTIP
Stock Based Compensation
Stock based compensation expense		$ 0	$ 0