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Net Income Per Share (Tables) | 12 Months Ended
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Sep. 30, 2023
Net Income Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share data):
|  | Years Ended September 30,
|  | 2023 |  | 2022 |  | 2021
Numerator |  |  |  |  |  |
Net income |  | $ | 394,948 |  |  | $ | 322,160 |  |  | $ | 331,241 |
Denominator |  |  |  |  |  |
Weighted average shares outstanding — basic |  | 59,909 |  |  | 60,274 |  |  | 60,707 |
Dilutive effect of common shares from stock options and restricted stock units |  | 361 |  |  | 823 |  |  | 1,350 |
Weighted average shares outstanding — diluted |  | 60,270 |  |  | 61,097 |  |  | 62,057 |
Basic net income per share |  | $ | 6.59 |  |  | $ | 5.34 |  |  | $ | 5.46 |
Diluted net income per share |  | $ | 6.55 |  |  | $ | 5.27 |  |  | $ | 5.34 |

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- Definition Net Income Per Share [Abstract] + References No definition available. + Details
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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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