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EARNINGS PER SHARE | 9 Months Ended
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Jun. 30, 2021
EARNINGS PER SHARE |
EARNINGS PER SHARE | 6. EARNINGS PER SHARE ​ Basic earnings per share available to common shareholders is calculated by dividing net income by the weighted average number of common shares outstanding for each period. Diluted earnings per share available to common shareholders is calculated by dividing income from operations by the sum of the weighted average number of common shares outstanding and the weighted average dilutive equity awards.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended June
​ | ​ | 2021 | ​ | 2020
​ |  | Basic |  | Diluted |  | Basic |  | Diluted
Weighted average number of common shares outstanding | ​ | ​ | 551,369 | ​ | ​ | 551,369 | ​ | ​ | 565,483 | ​ | ​ | 565,483
Weighted average net additional shares outstanding assuming dilutive options exercised and proceeds used to purchase treasury stock (1) | ​ | ​ | — | ​ | ​ | 18,112 | ​ | ​ | — | ​ | ​ | 4,419
Weighted average number of shares outstanding | ​ | ​ | 551,369 | ​ | ​ | 569,481 | ​ | ​ | 565,483 | ​ | ​ | 569,902
Net income available to common shareholders | ​ | $ | 3,691,210 | ​ | $ | 3,691,210 | ​ | $ | 1,579,566 | ​ | $ | 1,579,566
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net earnings per share available to common shareholders | ​ | $ | 6.69 | ​ | $ | 6.48 | ​ | $ | 2.79 | ​ | $ | 2.77
(1) | Diluted earnings per share calculation includes all stock options and restricted stock units deemed to be dilutive.
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended June
​ | ​ | 2021 | ​ | 2020
​ |  | Basic |  | Diluted |  | Basic |  | Diluted
Weighted average number of common shares outstanding | ​ | ​ | 550,276 | ​ | ​ | 550,276 | ​ | ​ | 564,578 | ​ | ​ | 564,578
Weighted average net additional shares outstanding assuming dilutive options exercised and proceeds used to purchase treasury stock (1) | ​ | ​ | — | ​ | ​ | 11,664 | ​ | ​ | — | ​ | ​ | 5,295
Weighted average number of shares outstanding | ​ | ​ | 550,276 | ​ | ​ | 561,940 | ​ | ​ | 564,578 | ​ | ​ | 569,873
Net income available to common shareholders | ​ | $ | 9,197,728 | ​ | $ | 9,197,728 | ​ | $ | 2,730,754 | ​ | $ | 2,730,754
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net earnings per share available to common shareholders | ​ | $ | 16.71 | ​ | $ | 16.37 | ​ | $ | 4.84 | ​ | $ | 4.79
(1) | Diluted earnings per share calculation includes all stock options and restricted stock units deemed to be dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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