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Selected Consolidated Quarterly Financial Data (Unaudited) - Summary of Basic and Diluted Net Income (Loss) per Common Share Available to Common Shareholders (Detail) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Net income per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per common share available to common shareholders - Basic | $ 0.35 | $ 0.09 | $ 0.38 | $ 0.55 | $ 0.66 | $ (0.48) | $ 0.10 | $ 0.97 | $ 0.24 | $ 0.67 | $ 0.23 | $ 0.28 | $ 1.37 | $ 1.34 | $ 1.41
Net income per common share available to common shareholders - Diluted | $ 0.35 | $ 0.09 | $ 0.38 | 0.54 | 0.65 | (0.48) | 0.10 | 0.96 | 0.24 | 0.66 | 0.23 | 0.28 | $ 1.36 | 1.32 | 1.40
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per common share available to common shareholders - Basic |  |  |  | 0.80 | 1.04 | (0.89) | 0.20 | 2.00 | 0.49 | 1.40 | 0.48 | 0.62 |  | 2.46 | 3.01
Net income per common share available to common shareholders - Diluted |  |  |  | $ 0.55 | $ 0.65 | $ (0.89) | $ 0.10 | $ 0.96 | $ 0.23 | $ 0.66 | $ 0.23 | $ 0.28 |  | $ 1.32 | $ 1.40

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