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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 532,304 | $ 498,564 | $ 405,283 | $ 368,590 | $ 331,708 | $ 366,486 | $ 438,191 | $ 487,847 | $ 1,804,741 | $ 1,624,232 | $ 3,161,702
Operating income (loss) | (29,677) | (28,028) | (65,672) | (49,164) | (93,001) | (13,256) | 41,621 | 38,670 | (172,541) | (25,966) | 671,963
Income (loss) from continuing operations | (21,711) | (23,125) | (48,473) | (34,554) | (72,869) | (21,193) | 25,174 | 15,898 | (127,863) | (52,990) | 420,474
Net income (loss) | $ (22,532) | $ (21,799) | $ (48,818) | $ (35,063) | $ (72,835) | $ (21,200) | $ 21,205 | $ 16,002 | $ (128,212) | $ (56,828) | $ 420,427
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share) | $ (0.20) | $ (0.22) | $ (0.45) | $ (0.33) | $ (0.68) | $ (0.20) | $ 0.23 | $ 0.15 | $ (1.20) | $ (0.50) | $ 3.88
Net income (in dollars per share) | (0.21) | (0.21) | (0.45) | (0.33) | (0.68) | (0.20) | 0.19 | 0.15 | (1.20) | (0.54) | 3.88
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share) | (0.20) | (0.22) | (0.45) | (0.33) | (0.68) | (0.20) | 0.23 | 0.15 | (1.20) | (0.50) | 3.85
Net income (in dollars per share) | $ (0.21) | $ (0.21) | $ (0.45) | $ (0.33) | $ (0.68) | $ (0.20) | $ 0.19 | $ 0.15 | $ (1.20) | $ (0.54) | $ 3.85
Gain (loss) from the sale of assets, net | $ 2,300 | $ 1,300 | $ 10,100 | $ 600 | $ 1,400 |  | $ 1,500 | $ 2,900 |  |  |
Gain (loss) from the sale of assets, per diluted share (in dollars per share) | $ 0.02 | $ 0.01 | $ 0.09 | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.03 |  |  |
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 after tax |  |  |  |  | $ 15,900 |  |  |  |  |  |
Loss from an other-than-temporary impairment of available-for-sale securities net of tax 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 |  |  |  |  |  |

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