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Restructuring Charges (Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2009 2009 Restructuring Plan [Member] segment | Jan. 31, 2012 2012 Restructuring Plan [Member] segment | Apr. 30, 2014 2012 Restructuring Plan [Member] segment | Apr. 30, 2014 2012 And 2009 Restructuring Plan [Member] | Apr. 30, 2013 2012 And 2009 Restructuring Plan [Member] | Apr. 30, 2012 2012 And 2009 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Plants committed to close |  |  |  | 2 | 2 |  |  |  |
Pre-tax restructuring charges | $ (234,000) | $ 1,433,000 | $ 16,321,000 |  |  |  | $ (234,000) | $ 1,400,000 | $ 16,300,000
Recognized recurring operating costs for closed facilities |  |  |  |  |  | 300,000 |  |  |
Number of manufacturing plants held for sale |  |  |  |  |  | 1 |  |  |
Recognized gain from sale of plant | 300,000 |  |  |  |  |  |  |  |
Net book value of plants recoverable | $ 1,000,000 |  |  |  |  |  |  |  |

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- Definition Amount of cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as 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 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 + Details
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