14. Segment Information (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated - USD ($) $ in Thousands	Apr. 30, 2019	May 01, 2018	Apr. 30, 2018
Identifiable assets:
Identifiable Assets	$ 86,771	$ 84,177	$ 83,584
Frequency Electronics Inc New York [Member]
Identifiable assets:
Identifiable Assets	54,295		55,181
Frequency Electronics Inc Zyfer [Member]
Identifiable assets:
Identifiable Assets	10,478		8,168
Inter Segment [Member]
Identifiable assets:
Identifiable Assets	(8,346)		(11,888)
Corporate Segment [Member]
Identifiable assets:
Identifiable Assets	$ 30,344		$ 32,123