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Consolidated Statements Of Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Retained Earnings [Member]	Total
Balance at Apr. 30, 2010	$ 64,439	$ 759,880	$ 824,319
Net earnings		94,623	94,623
Dividends declared		(20,467)	(20,467)
Repurchase of common stock	(66,890)	(434,136)	(501,026)
Proceeds from exercise of stock options	3,733		3,733
Tax benefits related to nonqualified stock options	648		648
Stock based compensation	2,066		2,066
Balance at Apr. 30, 2011	3,996	399,900	403,896
Net earnings		116,791	116,791
Dividends declared		(22,849)	(22,849)
Proceeds from exercise of stock options	3,249		3,249
Tax benefits related to nonqualified stock options	1,162		1,162
Stock based compensation	3,792		3,792
Balance at Apr. 30, 2012	12,199	493,842	506,041
Net earnings		110,625	110,625
Dividends declared		(25,291)	(25,291)
Proceeds from exercise of stock options	4,721		4,721
Tax benefits related to nonqualified stock options	1,929		1,929
Stock based compensation	4,270		4,270
Balance at Apr. 30, 2013	$ 23,119	$ 579,176	$ 602,295

X

- Definition

Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for common shareholders during the period.

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Amount of excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified equity-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) reduces (increases) net cash provided by operating activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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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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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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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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