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Fair Value Measurements - Pulse purchase agreement (Details) - Pulse Aerospace, LLC				3 Months Ended	9 Months Ended
	Feb. 26, 2020 USD ($)	Feb. 20, 2020 USD ($)	Jun. 10, 2019 USD ($) item	Jan. 25, 2020 item	Jan. 25, 2020 USD ($)
Fair Value Measurement
Total cash consideration	$ 2,500,000	$ 2,500,000	$ 18,677,000
Each milestone achievement	$ 2,500,000	$ 2,500,000
Number of research and development milestones | item			2	1
Business acquisitions gain					$ 832,000
Maximum
Fair Value Measurement
Total cash consideration					$ 5,000,000
Each milestone achievement			$ 2,500,000

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Represents the amount of each milestone achievement contingent consideration under business combination

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The net gains or losses recognized for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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