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Note 9 - Pension Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2016 | May 02, 2015 | May 03, 2014
Pension Contributions | $ 2.9 | $ 2.7 | $ 2.7

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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration