Note C - Finance Receivables (Details) - Changes in the Finance Receivables Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Changes in the Finance Receivables Allowance for Credit Losses [Abstract]
Balance	$ 86,033	$ 75,345
Provision for credit losses	27,876	26,530
Charge-offs, net of recovered collateral	(24,383)	(23,067)
Balance	$ 89,526	$ 78,808