Note C - Finance Receivables (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		13 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014
Receivables [Abstract]
Finance Receivables Interest Rate Range Start	11.00%
Finance Receivable Interest Rate Range End	19.00%
Finance Receivables Payment Periods Start	18 months
Finance Receivables Payment Periods End	36 months
Installment Sale Contracts,Weighted Average Interest Rate	14.90%
Finance Receivables, Number Of Loan Classes	1
Finance Receivables, Number Of Risk Pools	1
Net Charge Offs As Percentage of Average Finance Receivables	19.80%	18.10%
Accounts Receivable Allowance For Credit Losses Percentage	23.50%	21.50%	23.50%
Financing Receivable, Allowance for Credit Losses, Write-downs (in Dollars)	$ 7.7		$ 7.7
Financing Receivable Allowance For Credit Losses Net Of Tax Effects (in Dollars)	$ 4.9
Collections As Percentage of Average Finance Receivables	40.50%	42.80%
Dellinquecies Greater Than 30 Days As Percentage Of Average Finance Receivables	5.80%	6.00%	5.80%