Note C - Finance Receivables, Net - Changes in the Finance Receivables Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Balance			$ 117,821	$ 109,693
Provision for credit losses	$ 35,555	$ 37,872	111,619	110,778
Charge-offs, net of recovered collateral			(101,460)	(103,203)
Balance	$ 127,980	$ 117,268	$ 127,980	$ 117,268