NOTE F - SEGMENT INFORMATION (Detail) - Reconciliation of Assets from Segment to Consolidated (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Apr. 30, 2012
Identifiable assets:
Assets	$ 108,280	$ 106,227
Frequency Electronics Inc New York [Member]
Identifiable assets:
Assets	54,293	50,234
Frequency Electronics Inc New York China [Member]
Identifiable assets:
Assets	3,600	3,600
Gillam Frequency Electronics Inc [Member]
Identifiable assets:
Assets	19,818	20,407
Frequency Electronics Inc Zyfer [Member]
Identifiable assets:
Assets	7,261	9,685
Inter Segment [Member]
Identifiable assets:
Assets	(15,157)	(16,424)
Corporate [Member]
Identifiable assets:
Assets	$ 42,065	$ 42,325