Note C - Finance Receivables, Net - Changes in the Finance Receivables Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Balance	$ 109,693	$ 102,485
Provision for credit losses	34,160	33,381
Charge-offs, net of recovered collateral	(30,120)	(27,844)
Balance	$ 113,733	$ 108,022