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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