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Note C - Finance Receivables (Details) - Financing receivables analysis	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Financing receivables analysis [Abstract]
Principal collected as a percent of average finance receivables	13.80%	14.90%
Average down-payment percentage	6.60%	7.20%
Average originating contract term (in months)	27 months 21 days	26 months 21 days
Portfolio weighted average contract term, including modifications (in months)	29 months 15 days	28 months 3 days