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Reconciliation of Segment Identifiable Assets to Consolidated Assets (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 110,718	$ 106,227
FEI-NY (approximately $3 million in China)
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	54,312	50,234
Gillam-FEI (all in Belgium or France)
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	19,509	20,407
FEI-Zyfer
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	7,577	9,685
Inter Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	(14,832)	(16,424)
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 44,152	$ 42,325

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Concepts (CON)

-Number 6

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration