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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2021
Accounting Policies [Abstract] |
Earnings Per Share Basic And Diluted | The following table presents the calculation for both basic and diluted EPS:
(in thousands, except per share data) |  | Year ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net income (loss) |  | $ | 476,923 |  |  | $ | 130,695 |  |  | $ | (27,460 | )
Weighted average shares outstanding |  |  | 116,836 |  |  |  | 115,663 |  |  |  | 117,724 |
Dilutive effect of employee stock options, restricted shares and restricted stock units |  |  | 1,531 |  |  |  | 604 |  |  |  | — |
Diluted weighted average shares outstanding |  |  | 118,367 |  |  |  | 116,267 |  |  |  | 117,724 |
Basic earnings (loss) per share |  | $ | 4.08 |  |  | $ | 1.13 |  |  | $ | (0.23 | )
Diluted earnings (loss) per share |  | $ | 4.03 |  |  | $ | 1.12 |  |  | $ | (0.23 | )

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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