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Segment Information - Additional Information (Detail)	3 Months Ended
	Oct. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Number of reportable segments	3
FEI-NY
Segment Reporting, Asset Reconciling Item [Line Items]
Number of principal markets	3

X

- Definition

Number of Principal Markets

+ References

No definition available.

+ Details

Name:	feim_NumberOfPrincipalMarkets
Namespace Prefix:	feim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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