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Goodwill | 12 Months Ended
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Apr. 30, 2022
Goodwill. |
Goodwill | 7. Goodwill ​ The following table presents the changes in the Company’s goodwill balance (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Small UAS | ​ | TMS | ​ | MUAS | ​ | HAPS | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Small UAS | ​ | TMS | ​ | MUAS | ​ | HAPS | ​ | All other | ​ | Total
Balance at April 30, 2020 | ​ | $ | 6,340 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 6,340
Additions to goodwill | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 288,611 | ​ | ​ | — | ​ | ​ | 19,254 | ​ | ​ | 307,865
Balance at April 30, 2021 | ​ | $ | 6,340 | ​ | $ | — | ​ | $ | 288,611 | ​ | $ | — | ​ | $ | 19,254 | ​ | $ | 314,205
​ 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 is attributable 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, 2021 to the MUAS segment is attributable to the Arcturus Acquisition, and the addition to All other is attributable to the ISG acquisition. The goodwill balance at April 30, 2020 is attributable to the acquisition of Pulse. Refer to Note 21—Business Acquisitions for further details.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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