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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Data | A summary of financial data for each quarter of fiscal 2020 and 2019 follows. Due to the seasonal nature of the Company’s businesses, quarterly amounts vary significantly during the fiscal year. In the opinion of management, the information furnished reflects all adjustments necessary for a fair presentation of the results of the interim periods.
| First | Second | Third | Fourth
(Thousands, except per share data) | Quarter | Quarter | Quarter | Quarter
2020 |  |  |  |
Operating revenues | $ | 615,036 |  | $ | 639,614 |  | $ | 298,974 |  | $ | 400,044 |
Operating income (loss) | $ | 104,618 |  | $ | 98,483 |  | $ | (16,847) |  | $ | 42,655 |
Net income (loss) | $ | 75,752 |  | $ | 73,846 |  | $ | (19,298) |  | $ | 32,707 |
Earnings (loss) per share (1) |  |  |  |
Basic | $0.82 | $0.78 | $(0.20) | $0.34
Diluted | $0.82 | $0.77 | $(0.20) | $0.34
2019 |  |  |  |
Operating revenues | $ | 811,767 |  | $ | 866,255 |  | $ | 434,942 |  | $ | 479,081 |
Operating income (loss) (2) | $ | 91,273 |  | $ | 79,606 |  | $ | (1,372) |  | $ | (4,951) |
Net income (loss) | $ | 75,371 |  | $ | 73,671 |  | $ | (13,080) |  | $ | (12,027) |
Earnings (loss) per share (1) |  |  |  |
Basic | $0.87 | $0.83 | $(0.15) | $(0.16)
Diluted | $0.87 | $0.83 | $(0.15) | $(0.17)
(1)The sum of quarterly amounts may not equal the annual amounts due to rounding. (2)Quarterly amounts have been reclassified to conform to the current period presentation due to the adoption of ASU No. 2017-07, an amendment to ASC 715, Compensation - Retirement Benefits. See Note 2. Summary of Significant Accounting Policies.

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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=121640914&loc=d3e1280-108306 + Details
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