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Goodwill | 12 Months Ended
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Apr. 30, 2023
Goodwill. |
Goodwill | 6. Goodwill ​ The following table presents the changes in the Company’s goodwill balance (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | SUAS | ​ | TMS | ​ | MUAS | ​ | All other | ​ | Total
Balance at April 30, 2022 | ​ | $ | 6,340 | ​ | $ | — | ​ | $ | 290,157 | ​ | $ | 37,850 | ​ | $ | 334,347
Additions to goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,633 | ​ | ​ | 838 | ​ | ​ | 2,471
Impairment of goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (156,017) | ​ | ​ | — | ​ | ​ | (156,017)
Balance at April 30, 2023 | ​ | $ | 6,340 | ​ | $ | — | ​ | $ | 135,773 | ​ | $ | 38,688 | ​ | $ | 180,801
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | SUAS | ​ | TMS | ​ | MUAS | ​ | All other | ​ | Total
Balance at April 30, 2021 | ​ | $ | 6,340 | ​ | $ | — | ​ | $ | 288,611 | ​ | $ | 19,254 | ​ | $ | 314,205
Additions to goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,546 | ​ | ​ | 18,596 | ​ | ​ | 20,142
Balance at April 30, 2022 | ​ | $ | 6,340 | ​ | $ | — | ​ | $ | 290,157 | ​ | $ | 37,850 | ​ | $ | 334,347
​ The addition during the fiscal year ended April 30, 2023 to the MUAS segment relates to the Planck Acquisition. The addition during the fiscal year ended April 30, 2023 to All other goodwill is attributable to the translation of the goodwill related to the Telerob Acquisition, which was recorded in Euros and translated to dollars at each reporting date. The addition during the fiscal year ended April 30, 2022 to the MUAS segment relates to measurement period adjustments for pre-acquisition tax returns. The addition to All other goodwill during the fiscal year ended April 30, 2022 is attributable to the Telerob Acquisition. Refer to Note 21—Business Acquisitions for further details. ​ Subsequent to the performance of the Company’s annual goodwill impairment test, in May 2023, a trigger event was identified that indicated that the carrying value of the MUAS reporting unit exceeded its fair value. Specifically, the Company received notification that it was not down selected for a US DOD program of record which resulted in a significant decrease in the projected future cash flows of the MUAS reporting unit. As a result, the Company updated its estimates of long-term future cash flows to reflect lower revenue and EBITDA growth rate expectations used in the valuation of the MUAS reporting unit. These changes in estimates resulted in the recognition of a goodwill impairment charge of $156,017,000 in the MUAS reporting unit.

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