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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Sep. 30, 2019
Quarterly Financial Information Disclosure [Abstract] |
Summary of Selected Quarterly Financial Data |
| Fiscal Year 2019 Quarters Ended
(in thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total (1)
Operating revenues | $ | 740,598 |  |  | $ | 720,868 |  |  | $ | 687,974 |  |  | $ | 649,050 |  |  | $ | 2,798,490 |
Operating income (loss) | 54,289 |  |  | 95,146 |  |  | (167,874 | ) |  | 39,021 |  |  | 20,582 |
Income (loss) from continuing operations | 8,364 |  |  | 71,857 |  |  | (154,621 | ) |  | 41,890 |  |  | (32,510 | )
Net income (loss) | 18,959 |  |  | 60,891 |  |  | (154,683 | ) |  | 41,177 |  |  | (33,656 | )
Basic earnings per common share: |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 0.07 |  |  | 0.65 |  |  | (1.42 | ) |  | 0.38 |  |  | (0.33 | )
Net income (loss) | 0.17 |  |  | 0.55 |  |  | (1.42 | ) |  | 0.37 |  |  | (0.34 | )
Diluted earnings per common share: |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 0.07 |  |  | 0.65 |  |  | (1.42 | ) |  | 0.38 |  |  | (0.33 | )
Net income (loss) | 0.17 |  |  | 0.55 |  |  | (1.42 | ) |  | 0.37 |  |  | (0.34 | )
(1) The sum of earnings per share for the four quarters may not equal the total earnings per share for the fiscal year due to changes in the average number of common shares outstanding.
| Fiscal Year 2018 Quarters Ended
| As adjusted, Note 2
(in thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total (1)
Operating revenues | $ | 564,087 |  |  | $ | 577,484 |  |  | $ | 648,872 |  |  | $ | 696,825 |  |  | $ | 2,487,268 |
Operating income (loss) | 3,609 |  |  | (1,164 | ) |  | 6,306 |  |  | 24,213 |  |  | 32,964 |
Income (loss) from continuing operations | 500,642 |  |  | (1,633 | ) |  | (8,174 | ) |  | 2,175 |  |  | 493,010 |
Net income (loss) | 500,106 |  |  | (11,879 | ) |  | (8,008 | ) |  | 2,453 |  |  | 482,672 |
Basic earnings per common share: |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 4.57 |  |  | (0.03 | ) |  | (0.08 | ) |  | 0.02 |  |  | 4.49 |
Net income (loss) | 4.57 |  |  | (0.12 | ) |  | (0.08 | ) |  | 0.02 |  |  | 4.39 |
Diluted earnings per common share: |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 4.55 |  |  | (0.03 | ) |  | (0.08 | ) |  | 0.02 |  |  | 4.47 |
Net income (loss) | 4.55 |  |  | (0.12 | ) |  | (0.08 | ) |  | 0.02 |  |  | 4.37 |
(1) The sum of earnings per share for the four quarters may not equal the total earnings per share for the year due to changes in the average number of common shares outstanding.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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