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Earnings per Share | 12 Months Ended
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Sep. 30, 2022
Earnings Per Share [Abstract] |
Earnings per Share | 15. Earnings per Share The calculations of basic and diluted net income per share and basic and diluted weighted average shares outstanding are as follows for the fiscal years ended September 30, 2022, 2021 and 2020 (in thousands, except per share data): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended September 30,
​ |  | 2022 |  | 2021 |  | 2020
Loss from continuing operations | ​ | $ | (11,286) | ​ | $ | (28,869) | ​ | $ | (26,362)
Income from discontinued operations, net of tax | ​ |  | 2,144,145 | ​ |  | 139,616 | ​ |  | 91,215
Net income | ​ | ​ | 2,132,859 | ​ | ​ | 110,747 | ​ | ​ | 64,853
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average common shares outstanding used in computing basic earnings per share | ​ |  | 74,897 | ​ |  | 74,229 | ​ |  | 73,557
Dilutive restricted stock units | ​ |  | — | ​ |  | 226 | ​ |  | 293
Weighted average common shares outstanding used in computing diluted earnings per share | ​ |  | 74,897 | ​ |  | 74,455 | ​ |  | 73,850
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic net income per share: | ​ |  |  | ​ |  |  | ​ |  |
Loss from continuing operations | ​ | $ | (0.15) | ​ | $ | (0.39) | ​ | $ | (0.36)
Income from discontinued operations, net of tax | ​ |  | 28.63 | ​ |  | 1.88 | ​ |  | 1.24
Basic net income per share | ​ | $ | 28.48 | ​ | $ | 1.49 | ​ | $ | 0.88
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income per share: | ​ |  |  | ​ |  |  | ​ |  |
Loss from continuing operations | ​ | $ | (0.15) | ​ | $ | (0.39) | ​ | $ | (0.36)
Income from discontinued operations, net of tax | ​ |  | 28.63 | ​ |  | 1.88 | ​ |  | 1.24
Diluted net income per share | ​ | $ | 28.48 | ​ | $ | 1.49 | ​ | $ | 0.88
​ ​ Restricted stock units of 64,122, 24,012 and 16,695, respectively, during fiscal year 2022, 2021 and 2020 were excluded from the computation of diluted earnings per share as their effect would be anti-dilutive based on the treasury stock method.

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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 https://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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI https://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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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