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Allowance for Doubtful Accounts Continuity Schedule (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Allowance for Sales Return and Doubtful Accounts [Line Items]
Balance, beginning of the year	$ (482)	$ (11,314)
Additional recovery (allowances)	(3,054)	1,981
Net write-offs and collections	931	8,851
Balance, end of the year	$ (2,605)	$ (482)

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

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