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Consolidated Statements Of Income And Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Income Statement [Abstract]
Tax effect of unrealized holding gains (losses) arising during the year	$ (5,065)	$ 152
Tax effect of reclassification adjustment for gains included in income	$ 0	$ 0

- Definition

Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

+ References+ Details

- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

+ References+ Details