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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 331,708 | $ 366,486 | $ 438,191 | $ 487,847 | $ 553,800 | $ 661,445 | $ 885,670 | $ 1,060,787 | $ 1,624,232 | $ 3,161,702 | $ 3,715,968
Operating income | (93,001) | (13,256) | 41,621 | 38,670 | (24,783) | 135,049 | 231,326 | 330,371 | (25,966) | 671,963 | 1,053,174
Income (loss) from continuing operations | (72,869) | (21,193) | 25,174 | 15,898 | (27,590) | 90,899 | 153,542 | 203,623 | (52,990) | 420,474 | 706,610
Net income (loss) | $ (72,835) | $ (21,200) | $ 21,205 | $ 16,002 | $ (27,596) | $ 90,872 | $ 153,543 | $ 203,608 | $ (56,828) | $ 420,427 | $ 706,563
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share) | $ (0.68) | $ (0.20) | $ 0.23 | $ 0.15 | $ (0.26) | $ 0.84 | $ 1.42 | $ 1.87 | $ (0.50) | $ 3.88 | $ 6.52
Net income (in dollars per share) | (0.68) | (0.20) | 0.19 | 0.15 | (0.26) | 0.84 | 1.42 | 1.87 | (0.54) | 3.88 | 6.52
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share) | (0.68) | (0.20) | 0.23 | 0.15 | (0.26) | 0.83 | 1.41 | 1.86 | (0.50) | 3.85 | 6.44
Net income (in dollars per share) | $ (0.68) | $ (0.20) | $ 0.19 | $ 0.15 | $ (0.26) | $ 0.83 | $ 1.41 | $ 1.86 | $ (0.54) | $ 3.85 | $ 6.44
Increase in net loss due to change in accounting principle |  |  |  |  | $ 6,400 |  |  |  |  |  |
Increase in diluted loss per common share due to change in accounting principle |  |  |  |  | $ 0.06 |  |  |  |  |  |
Gain (loss) from the sale of assets, net | $ (1,400) |  | $ 1,500 | $ 2,900 | $ 1,900 | $ 1,100 | $ 1,800 | $ 2,600 |  |  |
Gain (loss) from the sale of assets, per diluted share (in dollars per share) | $ (0.01) |  | $ 0.01 | $ 0.03 | $ 0.02 | $ 0.01 | $ 0.02 | $ 0.02 |  |  |
Loss related to currency exchange losses, net of tax |  |  |  | $ 5,400 |  |  |  |  |  |  |
Loss related to currency exchange losses, per diluted share (in dollars per share) |  |  |  | $ 0.05 |  |  |  |  |  |  |
After-tax impairment charge |  | $ 2,900 |  |  |  |  |  |  |  |  |
After-tax impairment charge, per diluted share (in dollars per share) |  | $ 0.03 |  |  |  |  |  |  |  |  |
Loss from an other-than-temporary impairment of available-for-sale securities | $ 15,900 |  |  |  |  |  |  |  |  |  |
Loss from an other-than-temporary impairment of available-for-sale securities, per diluted share (in dollars per share) | $ 0.15 |  |  |  |  |  |  |  |  |  |
Loss from an litigation settlement, net of tax | $ 12,000 |  |  |  |  |  |  |  |  |  |
Loss from an litigation settlement, per diluted share (in dollars per share) | $ 0.11 |  |  |  |  |  |  |  |  |  |
After-tax abandonment charge |  |  |  |  |  |  | $ 6,700 |  |  |  |
After-tax abandonment charge, per diluted share (in dollars per share) |  |  |  |  |  |  | $ 0.06 |  |  |  |

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