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Net Income (Loss) Per Common Share - Additional Information (Detail) - 1.50% Senior Subordinated Convertible Notes Due in October 2020 - $ / shares | Sep. 30, 2021 | Sep. 30, 2020
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Earnings Per Share [Line Items] |  |
Convertible notes stated rate | 1.50% |
Debt instrument, convertible, conversion price, per share (in dollars per share) |  | $ 94.15

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