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Consolidated Statements Of Income And Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Consolidated Statements Of Income And Comprehensive Income [Abstract]
Tax effect of unrealized holding gains (losses) arising during the year	$ 2,121	$ 58	$ 188
Tax effect of reclassification adjustment for gains included in income	$ 58	$ (133)	$ 811

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.