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Restructuring Charges (Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2009 2009 Restructuring Plan[Member] segment | Jan. 31, 2012 2012 Restructuring Plan [Member] segment | Apr. 30, 2013 2012 Restructuring Plan [Member] segment | Apr. 30, 2012 2012 Restructuring Plan [Member] | Apr. 30, 2013 2012 Restructuring Plan [Member] Facilities-Related [Member] | Apr. 30, 2013 2012 Restructuring Plan [Member] Building Impairment [Member] | Apr. 30, 2013 2012 Restructuring Plan [Member] Severance And Separations Costs [Member] | Apr. 30, 2013 2012 Restructuring Plan [Member] Professional Fees [Member] | Apr. 30, 2013 2012 And 2009 Restructuring Plan [Member] | Apr. 30, 2012 2012 And 2009 Restructuring Plan [Member] | Apr. 30, 2011 2012 And 2009 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plants committed to close |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |
Number of manufacturing plants held for sale |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Pre-tax restructuring charges | $ 1,433,000 | $ 16,321,000 | $ 62,000 |  |  | $ 1,400,000 | $ 15,900,000 | $ 700,000 | $ 300,000 | $ 200,000 | $ 200,000 | $ 1,400,000 | $ 16,300,000 | $ 62,000
Reserve for restructuring charges | 13,000 | 2,817,000 |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge relating to plants included as held for sale | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value of plants recoverable | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized recurring operating costs for closed facilities |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |
Recognized gain from sale of plant | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This element represents cash provided by or used in the operating activities of the entity's discontinued operations during the period. This element is only used by those entities that separately report cash flows attributable to discontinued operations. If using this element, it is an indication that the cash flows of the entity which are detailed in reconciling to cash provided by or used in operating activities reflect only cash flows attributable to continuing operations. + 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=6943989&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The loss recognized for any initial write-down from carrying value to fair value less cost to sell for a classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 33, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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