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Goodwill | 6 Months Ended
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Oct. 30, 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 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,395 | ​ | ​ | 20,288 | ​ | ​ | 21,683
Impairment of goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at October 30, 2021 | ​ | $ | 6,340 | ​ | $ | - | ​ | $ | 290,006 | ​ | $ | 39,542 | ​ | $ | 335,888
​ The goodwill balance at April 30, 2021 is attributable to the acquisitions of Pulse, ISG, and Arcturus acquisitions. The MUAS addition to goodwill relates to measurement period adjustments for pre-acquisition tax returns. The addition to All other goodwill is attributable to the Telerob acquisition. Refer to Note 18—Business Acquisitions for further details.

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