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Fair Value and Unrealized Losses, Aggregated by Investment Type and Length of Time Individual Securities have been in Continuous Unrealized Loss Position (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Fair Value		$ 840
Unrealized Losses		(175)
Fair Value	129
Unrealized Losses	(1)
Fair Value	129	840
Unrealized Losses	(1)	(175)
Fixed income securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		301
Unrealized Losses		(6)
Fair Value
Unrealized Losses
Fair Value		301
Unrealized Losses		(6)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		539
Unrealized Losses		(169)
Fair Value	129
Unrealized Losses	(1)
Fair Value	129	539
Unrealized Losses	$ (1)	$ (169)

X

- Definition

Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities.

+ References

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Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities.

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