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Fair Value Measurements - Pulse purchase agreement (Details) - Pulse Aerospace, LLC - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 10, 2018 | Jan. 25, 2020 | Apr. 30, 2020
Fair Value Measurement |  |  |
Contingent consideration paid | $ 1,703 |  | $ 2,500
Contingent consideration that will not be paid |  |  | 2,500
Maximum |  |  |
Fair Value Measurement |  |  |
Total cash consideration |  | $ 5,000 |
SG&A |  |  |
Fair Value Measurement |  |  |
Business acquisitions gain |  | $ 832 | $ 832

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