Note C - Finance Receivables, Net - Financing Receivables Analysis (Details)	6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Principal collected as a percent of average finance receivables	24.60%	25.60%
Average down-payment percentage	6.00%	5.80%
Average originating contract term (in months) (Month)	2 years 168 days	2 years 156 days