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Goodwill | 3 Months Ended
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Jul. 31, 2021
Goodwill. |
Goodwill | ​ 9. Goodwill ​ The following table presents the changes in the Company’s goodwill balance (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Small UAS | ​ | TMS | ​ | MUAS | ​ | All other | ​ | Total
Balance at April 30, 2021 | ​ | $ | 6,340 | ​ | $ | — | ​ | $ | 288,611 | ​ | $ | 19,254 | ​ | $ | 314,205
Additions to goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 20,824 | ​ | ​ | 20,824
Impairment of goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at July 31, 2021 | ​ | $ | 6,340 | ​ | $ | - | ​ | $ | 288,611 | ​ | $ | 40,078 | ​ | $ | 335,029
​ The goodwill balance at April 30, 2021 is attributable to the acquisitions of Pulse, ISG, and Arcturus acquisitions. The All other goodwill addition is attributable to the Telerob acquisition. Refer to Note 18—Business Acquisitions for further details.

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