Note C - Finance Receivables (Details) - Changes in the Finance Receivables Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Changes in the Finance Receivables Allowance for Credit Losses [Abstract]
Balance	$ 75,345	$ 65,831
Provision for credit losses	91,602	70,499
Charge-offs, net of recovered collateral	(76,005)	(60,764)
Balance	$ 90,942	$ 75,566