Note C - Finance Receivables, Net - Financing Receivables Analysis (Details)	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Principal collected as a percent of average finance receivables	12.40%	13.00%
Average down-payment percentage	6.20%	6.00%
Average originating contract term (in months) (Month)	2 years 174 days	2 years 159 days