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Inventories (Details) - USD ($) $ in Millions	Apr. 30, 2020	Apr. 30, 2019
Frequency Electronics Inc Zyfer [Member]
Inventories (Details) [Line Items]
Inventory Adjustments	$ 5.0	$ 1.1
Frequency Electronics Inc New York [Member]
Inventories (Details) [Line Items]
Inventory, Work in Process, Net of Reserves	$ 6.6

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Amount of inventory reserves for last-in first-out (LIFO) and other inventory valuation methods.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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