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Consolidated Statements Of Stockholders' Equity And Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Consolidated Statements Of Stockholders' Equity And Comprehensive Income [Abstract]
Unrealized investment gains (losses), tax	$ (810)	$ (623)	$ 112
Unrealized gains (losses) on derivative financial instruments, tax	$ 51	$ (128)	$ 100

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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- Definition

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

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