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Goodwill | 12 Months Ended
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Apr. 30, 2021
Goodwill. |
Goodwill | 7. Goodwill ​ The following table presents the changes in the Company’s goodwill balance (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | UAS | ​ | MUAS | ​ | Total
Balance at April 30, 2020 | ​ | $ | 6,340 | ​ | $ | — | ​ | $ | 6,340
Additions to goodwill | ​ | ​ | 19,254 | ​ | ​ | 288,611 | ​ | ​ | 307,865
Impairment of goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at April 30, 2021 | ​ | $ | 25,594 | ​ | $ | 288,611 | ​ | $ | 314,205
​ The goodwill balance at April 30, 2020 is attributable to the acquisition of Pulse. The UAS segment goodwill addition is attributable to the ISG acquisition. The MUAS goodwill addition is attributable to the Arcturus acquisition. Refer to Note 21—Business Acquisitions for further details.

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