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Restatement (Tables) | 12 Months Ended
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Sep. 30, 2019
Accounting Changes And Error Corrections [Abstract] |
Summary of Basic and Diluted Net Income per Common Share Available to Common Shareholders | The restatement adjustment did not impact our previously reported consolidated balance sheet, consolidated statements of stockholders' equity, consolidated statements of cash flows, or net income (in thousands, except per share data).
|  | Twelve Months Ended September 30, 2018 |
|  | As Previously Reported |  |  | As Restated |
Net income per common share available to common shareholders - Basic |  | $ | 2.46 |  |  | $ | 1.34 |
Shares used in computing net income per common share available to common shareholders - Basic |  |  | 13,516 |  |  |  | 24,826 |
Net income per common share available to common shareholders - Diluted |  | $ | 1.32 |  |  | $ | 1.32 |
Shares used in computing net income per common share available to common shareholders - Diluted |  |  | 25,171 |  |  |  | 25,257 |
|  | Twelve Months Ended September 30, 2017 |
|  | As Previously Reported |  |  | As Restated |
Net income per common share available to common shareholders - Basic |  | $ | 3.01 |  |  | $ | 1.41 |
Shares used in computing net income per common share available to common shareholders - Basic |  |  | 10,919 |  |  |  | 23,201 |
Net income per common share available to common shareholders - Diluted |  | $ | 1.40 |  |  | $ | 1.40 |
Shares used in computing net income per common share available to common shareholders - Diluted |  |  | 23,386 |  |  |  | 23,370 |
The restatement adjustment did not impact our previously reported consolidated balance sheet, consolidated statements of stockholders' equity, consolidated statements of cash flows, or net income (in thousands, except per share data).
|  | Three Months Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | As Previously Reported |  |  | As Restated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per share attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.80 |  |  | $ | 0.55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted |  | $ | 0.55 |  |  | $ | 0.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Three Months Ended December 31, 2017 |  |  | Three Months Ended March 31, 2018 |  |  | Three Months Ended June 30, 2018 |  |  | Three Months Ended September 30, 2018 |
|  | As Previously Reported |  |  | As Restated |  |  | As Previously Reported |  |  | As Restated |  |  | As Previously Reported |  |  | As Restated |  |  | As Previously Reported |  |  | As Restated |
Net income (loss) per share attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.00 |  |  | $ | 0.97 |  |  | $ | 0.20 |  |  | $ | 0.10 |  |  | $ | (0.89 | ) |  | $ | (0.48 | ) |  | $ | 1.04 |  |  | $ | 0.66 |
Diluted |  | $ | 0.96 |  |  | $ | 0.96 |  |  | $ | 0.10 |  |  | $ | 0.10 |  |  | $ | (0.89 | ) |  | $ | (0.48 | ) |  | $ | 0.65 |  |  | $ | 0.65 |
|  | Three Months Ended December 31, 2016 |  |  | Three Months Ended March 31, 2017 |  |  | Three Months Ended June 30, 2017 |  |  | Three Months Ended September 30, 2017 |
|  | As Previously Reported |  |  | As Restated |  |  | As Previously Reported |  |  | As Restated |  |  | As Previously Reported |  |  | As Restated |  |  | As Previously Reported |  |  | As Restated |
Net income per share attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.62 |  |  | $ | 0.28 |  |  | $ | 0.48 |  |  | $ | 0.23 |  |  | $ | 1.40 |  |  | $ | 0.67 |  |  | $ | 0.49 |  |  | $ | 0.24 |
Diluted |  | $ | 0.28 |  |  | $ | 0.28 |  |  | $ | 0.23 |  |  | $ | 0.23 |  |  | $ | 0.66 |  |  | $ | 0.66 |  |  | $ | 0.23 |  |  | $ | 0.24 |

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