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Reconciliation of Segment Identifiable Assets to Consolidated Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 106,090	$ 106,227
Frequency Electronics Inc New York China
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 3,000	$ 3,000

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.

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