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Note 2 - Correction of Immaterial Errors (Details) - Financial Revisions - Balance Sheet Data (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Deferred income taxes (asset)	$ 23,292	$ 16,066
Accrued expenses other	61,117	44,494
Deferred income taxes (liability)	318,023	293,708
Retained earnings	669,386	570,268
Total shareholders’ equity	703,264	593,387	503,944	403,896
Scenario, Previously Reported [Member]
Deferred income taxes (asset)	11,878	9,916
Accrued expenses other	33,171	29,436
Deferred income taxes (liability)	317,953	293,708
Retained earnings	685,988	579,176
Total shareholders’ equity	$ 719,866	$ 602,295

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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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