Note C - Finance Receivables (Details) - Changes in the Finance Receivables Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Changes in the Finance Receivables Allowance for Credit Losses [Abstract]
Balance	$ 86,033	$ 75,345
Provision for credit losses	59,247	54,826
Charge-offs, net of recovered collateral	(52,820)	(49,472)
Balance	$ 92,460	$ 80,699