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, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Balance			$ 102,485	$ 93,224
Provision for credit losses	$ 37,645	$ 32,786	110,467	106,225
Charge-offs, net of recovered collateral			(101,134)	(95,221)
Balance	$ 111,818	$ 104,228	$ 111,818	$ 104,228