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Goodwill | 9 Months Ended
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Jan. 29, 2022
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 | ​ | ​ | 19,564 | ​ | ​ | 20,959
Impairment of goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at January 29, 2022 | ​ | $ | 6,340 | ​ | $ | - | ​ | $ | 290,006 | ​ | $ | 38,818 | ​ | $ | 335,164
​ 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, which was recorded in Euros and translated to dollars at each reporting date. Refer to Note 18—Business Acquisitions for further details.

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