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Note K - Stock-Based Compensation Plans (Details) - Stock Option Activity (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Note K - Stock-Based Compensation Plans (Details) - Stock Option Activity [Line Items]
Number of Shares (in Shares)	1,117,000	1,122,500	1,118,250	1,133,147
Intrinsic Value (in Dollars)	$ 24,294	$ 23,892	$ 22,881	$ 21,897
Weighted Average Exercise Price per Share	$ 21.75	$ 21.28	$ 20.46	$ 19.32
Number of Shares (in Shares)	25,000	40,000	73,750
Exercise Price per Share	$ 44.90	$ 45.02	$ 31.93
Intrinsic Value (in Dollars)	1,122	1,801	2,355
Weighted Average Exercise Price per Share	$ 44.90	$ 45.02	$ 31.93
Number of Shares (in Shares)	(30,500)	(35,750)	(88,647)
Exercise Price per Share	$ 23.58	$ 22.13	$ 15.46
Intrinsic Value (in Dollars)	$ (720)	$ (790)	$ (1,371)
Weighted Average Exercise Price per Share	$ 23.58	$ 22.13	$ 15.46
Minimum [Member]
Note K - Stock-Based Compensation Plans (Details) - Stock Option Activity [Line Items]
Exercise Price per Share	$ 11.90	$ 11.90	$ 11.83	$ 6.59
Exercise Price per Share	$ 44.52	$ 44.14	$ 24.69
Weighted Average Exercise Price per Share	$ 44.52	$ 44.14	$ 24.69
Exercise Price per Share	$ 23.34	$ 11.83	$ 6.59
Weighted Average Exercise Price per Share	$ 23.34	$ 11.83	$ 6.59
Maximum [Member]
Note K - Stock-Based Compensation Plans (Details) - Stock Option Activity [Line Items]
Exercise Price per Share	$ 46.44	$ 45.72	$ 45.72	$ 24.47
Exercise Price per Share	$ 46.44	$ 45.46	$ 45.72
Weighted Average Exercise Price per Share	$ 46.44	$ 45.46	$ 45.72
Exercise Price per Share	$ 23.75	$ 23.34	$ 24.69
Weighted Average Exercise Price per Share	$ 23.75	$ 23.34	$ 24.69

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The cash inflow associated with the amount received from holders on the exercise of granted stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with the amount received from holders on the exercise of outstanding stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Number of share options (or share units) exercised during the current period.

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