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Note C - Finance Receivables (Detail) - Financing receivables analysis
 3 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Principal collected as a percent of average finance receivables 14.90% 15.90%
Average down-payment percentage 7.20% 7.30%
Average originating contract term (in months) 26 months 21 days 26 months 12 days
Portfolio weighted average contract term, including modifications (in months) 28 months 3 days 27 months 12 days