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EARNINGS PER COMMON SHARE (Tables) | 12 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Information to Calculate Basic and Diluted Earnings (Loss) Per Common Share | The following table presents information necessary to calculate basic and diluted net income (loss) per common share for the periods indicated:
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
Net income (loss) | $ | 145.2 |  |  | $ | (34.9) |  |  | $ | (380.1) |
Basic net income (loss) per common share: |  |  |  |  |
Weighted-average common shares outstanding during the period | 57.6 |  |  | 56.8 |  |  | 56.0 |
Basic net income (loss) per common share | $ | 2.52 |  |  | $ | (0.61) |  |  | $ | (6.79) |
Diluted net income (loss) per common share: |  |  |  |  |
Weighted-average common shares outstanding during the period | 57.6 |  |  | 56.8 |  |  | 56.0 |
Dilutive potential common shares | 1.1 |  |  | — |  |  | — |
Weighted-average number of common shares outstanding and dilutive potential common shares | 58.7 |  |  | 56.8 |  |  | 56.0 |
Diluted net income (loss) per common share | $ | 2.47 |  |  | $ | (0.61) |  |  | $ | (6.79) |
Antidilutive stock options outstanding | 0.5 |  |  | 0.4 |  |  | 0.4 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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