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Earnings per Share (Tables) | 12 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | The following is a reconciliation of the numerator and denominator of the diluted net income per share computations for the periods presented below.
| Fiscal Year Ended September 30,
(in millions, except share amounts) | 2025 |  | 2024 |  | 2023
Numerator: |  |  |  |  |
Net income | $ | 305.9 |  |  | $ | 260.8 |  |  | $ | 238.5 |
Less: Allocation to participating securities | (10.4) |  |  | (9.1) |  |  | (8.1) |
Net income allocated to common stockholders | $ | 295.5 |  |  | $ | 251.7 |  |  | $ | 230.4 |
Denominator: |  |  |  |  |
Weighted average number of: |  |  |  |  |
Common shares outstanding | 47,431,675 |  |  | 45,808,855 |  |  | 44,904,000 |
Dilutive potential common shares outstanding: |  |  |  |  |
Share-based awards | 2,692,827 |  |  | 1,628,688 |  |  | 1,489,516 |
Diluted shares outstanding | 50,124,502 |  |  | 47,437,543 |  |  | 46,393,516 |
Earnings per share - basic | $ | 6.22 |  |  | $ | 5.49 |  |  | $ | 5.14 |
Earnings per share - diluted | $ | 5.89 |  |  | $ | 5.31 |  |  | $ | 4.97 |

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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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