Note C - Finance Receivables, Net - Financing Receivables Analysis (Details)	9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Principal collected as a percent of average finance receivables	38.00%	40.00%
Average down-payment percentage	6.40%	5.90%
Average originating contract term (in months) (Month)	33 months 21 days	30 months 24 days
Portfolio weighted average contract term, including modifications (in months) (Month)	35 months 21 days	32 months 15 days