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GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Income (Details) - USD ($) $ 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
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 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 costs and other |  |  |  |  |  |  |  |  | 1,977,282 | 1,650,198 | 2,489,739
Operating income (loss) from continuing operations | (29,677) | (28,028) | (65,672) | (49,164) | (93,001) | (13,256) | 41,621 | 38,670 | (172,541) | (25,966) | 671,963
Other income (expense), net |  |  |  |  |  |  |  |  | 7,690 | (23,788) | 4,939
Interest expense |  |  |  |  |  |  |  |  | (19,747) | (22,913) | (15,023)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (184,598) | (72,667) | 661,879
Income tax provision |  |  |  |  |  |  |  |  | (56,735) | (19,677) | 241,405
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
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  | 3,285 | 2,360 | (124)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 3,634 | 6,198 | (77)
Loss from discontinued operations |  |  |  |  |  |  |  |  | (349) | (3,838) | (47)
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
Eliminations |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | (67) | (70) | (75)
Operating costs and other |  |  |  |  |  |  |  |  | (882) | (1,323) | (3,104)
Operating income (loss) from continuing operations |  |  |  |  |  |  |  |  | 815 | 1,253 | 3,029
Other income (expense), net |  |  |  |  |  |  |  |  | (815) | (1,253) | (3,029)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 124,224 | 61,638 | (414,214)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 124,224 | 61,638 | (414,214)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 124,224 | 61,638 | (414,214)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 124,224 | 61,638 | (414,214)
Guarantor/Parent | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating costs and other |  |  |  |  |  |  |  |  | 16,566 | 13,145 | 10,875
Operating income (loss) from continuing operations |  |  |  |  |  |  |  |  | (16,566) | (13,145) | (10,875)
Other income (expense), net |  |  |  |  |  |  |  |  | (240) | (194) | (91)
Interest expense |  |  |  |  |  |  |  |  | (398) | (375) | (159)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (116,212) | (47,166) | 427,342
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (133,416) | (60,880) | 416,217
Income tax provision |  |  |  |  |  |  |  |  | (5,204) | (4,052) | (4,210)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (128,212) | (56,828) | 420,427
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (128,212) | (56,828) | 420,427
Issuer Subsidiary | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 1,575,787 | 1,373,511 | 2,735,863
Operating costs and other |  |  |  |  |  |  |  |  | 1,707,473 | 1,358,269 | 2,037,465
Operating income (loss) from continuing operations |  |  |  |  |  |  |  |  | (131,686) | 15,242 | 698,398
Other income (expense), net |  |  |  |  |  |  |  |  | 7,342 | (22,243) | 7,523
Interest expense |  |  |  |  |  |  |  |  | (20,136) | (20,256) | (8,955)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (8,012) | (14,472) | (13,128)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (152,492) | (41,729) | 683,838
Income tax provision |  |  |  |  |  |  |  |  | (38,600) | 5,127 | 258,536
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (113,892) | (46,856) | 425,302
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (113,892) | (46,856) | 425,302
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 229,021 | 250,791 | 425,914
Operating costs and other |  |  |  |  |  |  |  |  | 254,125 | 280,107 | 444,503
Operating income (loss) from continuing operations |  |  |  |  |  |  |  |  | (25,104) | (29,316) | (18,589)
Other income (expense), net |  |  |  |  |  |  |  |  | 1,403 | (98) | 536
Interest expense |  |  |  |  |  |  |  |  | 787 | (2,282) | (5,909)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (22,914) | (31,696) | (23,962)
Income tax provision |  |  |  |  |  |  |  |  | (12,931) | (20,752) | (12,921)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (9,983) | (10,944) | (11,041)
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  | 3,285 | 2,360 | (124)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 3,634 | 6,198 | (77)
Loss from discontinued operations |  |  |  |  |  |  |  |  | (349) | (3,838) | (47)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | $ (10,332) | $ (14,782) | $ (11,088)

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