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Assets Held for Sale (Details) - USD ($) | May 21, 2019 | Apr. 27, 2018 | Apr. 30, 2020
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FEI-Asia [Member] |  |  |
Assets Held for Sale (Details) [Line Items] |  |  |
Proceeds from Sales of Business, Affiliate and Productive Assets | $ 130,000 |  |
Disposal Group, Including Discontinued Operation, Revenue | 85,000 |  |
Gain (Loss) on Disposition of Business | $ (1,000,000) |  |
Gillam Frequency Electronics Inc [Member] |  |  |
Assets Held for Sale (Details) [Line Items] |  |  |
Proceeds from Divestiture of Businesses |  | $ 1,000,000 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent |  | $ 1,000,000 |
Financing Receivable, Allowance for Credit Loss, Current |  |  | $ 1,000,000

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- Definition Amount of allowance for credit loss on financing receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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