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Commitments And Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Commitments And Contingencies [Line Items] |  |  |
Warranty claims, period from original ship date | 2 months |  |
Total rental expenses | $ 8,005 | $ 7,378 | $ 7,206
Significant Shareholders [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Rent agreement term | 5 years |  |
Rent expense from remaining term | 927 |  |
Reltaed party rent expense | $ 470 | $ 461 | $ 460
Unpaid rent annual interest increase | 2.00% |  |

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- Details
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- Definition Rent Agreement Term + References No definition available. + Details
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- Definition Rent Expense From Remaining Term + References No definition available. + Details
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- Definition Unpaid Rent Annual Interest Increase + References No definition available. + Details
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- Definition Warranty Claims, Period From Original Ship Date + References No definition available. + Details
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- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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