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Note K - Stock-based Compensation Plans (Details Textual) - USD ($)					12 Months Ended
	Aug. 30, 2022	Aug. 26, 2020	Aug. 29, 2018	Aug. 05, 2015	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021	Aug. 28, 2018
Statement [Line Items]
Share-Based Payment Arrangement, Expense					$ 5,300,000	$ 5,500,000	$ 6,000,000.0
Share-Based Payment Arrangement, Expense, after Tax					4,100,000	4,200,000	$ 4,600,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value					$ 9,100,000	$ 8,400,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					140,000	30,000	30,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value					$ 5,100,000	$ 2,100,000	$ 2,000,000.0
Share-based Compensation Arrangement by Share-based Payment Award, Options Exercised Through Net Settlements (in shares)					5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Reduction in Shares Issued to Satisfy the Exercise Price and Applicable Withholding Taxes (in shares)					2,584
Share-based Compensation Arrangement by Share-based Payment Award, Options Exercised Through Net Settlements, Net of Shares to Satisfy the Exercise Price and Applicable Withholding Taxes (in shares)					2,416
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)					303,400
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value					$ 4,400,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)					5 years 7 months 6 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share)					$ 82.89
Share-Based Payment Arrangement, Option [Member]
Statement [Line Items]
Share-Based Payment Arrangement, Expense					$ 3,700,000	4,500,000	3,900,000
Share-Based Payment Arrangement, Expense, after Tax					2,900,000	3,400,000	3,000,000.0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount					$ 3,800,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					1 year 1 month 6 days
Share-Based Payment Arrangement, Option [Member] | Minimum [Member]
Statement [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					3 years
Share-Based Payment Arrangement, Option [Member] | Maximum [Member]
Statement [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					5 years
Restated Option Plan [Member]
Statement [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	185,000	200,000	200,000	300,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	2,385,000	2,200,000	2,000,000	1,800,000
Restated Option Plan [Member] | Share-Based Payment Arrangement, Option [Member]
Statement [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
Stock Incentive Plan [Member]
Statement [Line Items]
Share-Based Payment Arrangement, Expense					$ 1,600,000	981,000	1,100,000
Share-Based Payment Arrangement, Expense, after Tax					1,200,000	749,000	878,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)			450,000					100,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount					$ 5,900,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					3 years 10 months 24 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value					$ 11,100,000	$ 10,100,000	$ 9,900,000

X

- Definition

Represents the number of options exercised through net settlements during the period in accordance with plan provisions.

+ References

No definition available.

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Represents the number of options exercised through net settlements during the period in accordance with plan provisions, net of shares to satisfy the exercise price and applicable withholding taxes.

+ References

No definition available.

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- Definition

The grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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

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

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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