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Note K - Supplemental Cash Flow Information (Details) - Supplemental Cash Flow Disclosures (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Supplemental Cash Flow Disclosures [Abstract]
Interest paid	$ 2,151us-gaap_InterestPaid	$ 2,282us-gaap_InterestPaid
Income taxes paid, net	7,480us-gaap_IncomeTaxesPaidNet	7,578us-gaap_IncomeTaxesPaidNet
Inventory acquired in repossession and payment protection plan claims	$ 32,188us-gaap_FairValueOfAssetsAcquired	$ 32,842us-gaap_FairValueOfAssetsAcquired

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- Definition

The fair value of assets acquired in noncash investing or financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



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-Name Accounting Standards Codification

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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The amount of cash paid for interest during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586



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