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EQUITY METHOD INVESTMENT - Equity investee's summarized financial data (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
EQUITY METHOD INVESTMENT |  |  |  |
Total external revenue | $ 438,313,030 | $ 396,854,324 | $ 1,221,571,294 | $ 1,094,841,943
Gross profit | 25,541,706 | 21,652,280 | 71,976,471 | 63,190,444
Net income before income taxes | 4,012,917 | 2,053,900 | 10,710,604 | 3,787,088
Net income attributable to AMCON, net of tax | 754,293 | 111,666 | 1,403,124 | $ 111,666
Team Sledd | Equity method investment |  |  |  |
EQUITY METHOD INVESTMENT |  |  |  |
Total external revenue | 179,676,748 | 171,805,323 | 502,704,216 |
Gross profit | 9,711,966 | 6,874,963 | 25,279,274 |
Net income before income taxes | 2,034,258 | 335,093 | 3,979,078 |
Net income attributable to AMCON, net of tax | $ 754,293 | $ 111,666 | $ 1,403,124 |

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