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Organization and Significant Accounting Policies - Pulse Aerospace, LLC (Details) $ in Thousands	12 Months Ended
	Apr. 30, 2021 USD ($) segment	Feb. 19, 2021	Apr. 30, 2020 USD ($)	Jun. 10, 2019
Number of reportable segments | segment	2
Restricted cash | $	$ 8,322,000		$ 0
Pulse Aerospace, LLC
Ownership interest acquired				100.00%
Arcturus UAV Inc.
Ownership interest acquired		100.00%

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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