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Note C - Finance Receivables (Detail) - Financing receivables analysis
 9 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Principal collected as a percent of average finance receivables 42.80% 46.30%
Average down-payment percentage 5.80% 6.20%
Average originating contract term (in months) 28 months 9 days 26 months 18 days
Portfolio weighted average contract term, including modifications (in months) 28 months 21 days 27 months 21 days