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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, 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
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
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 costs and other |  |  |  |  |  |  |  |  | 1,650,198 | 2,489,739 | 2,662,794
Operating income (loss) from continuing operations | (93,001) | (13,256) | 41,621 | 38,670 | (24,783) | 135,049 | 231,326 | 330,371 | (25,966) | 671,963 | 1,053,174
Other income, net |  |  |  |  |  |  |  |  |  | 4,939 | 46,141
Other expense, net |  |  |  |  |  |  |  |  | (23,788) |  |
Interest expense |  |  |  |  |  |  |  |  | (22,913) | (15,023) | (4,657)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (72,667) | 661,879 | 1,094,658
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (19,677) | 241,405 | 388,048
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
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  | 2,360 | (124) | 2,758
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 6,198 | (77) | 2,805
Loss from discontinued operations |  |  |  |  |  |  |  |  | (3,838) | (47) | (47)
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
Eliminations |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (70) | (75) | (152)
Operating costs and other |  |  |  |  |  |  |  |  | (1,323) | (3,104) | (4,300)
Operating income (loss) from continuing operations |  |  |  |  |  |  |  |  | 1,253 | 3,029 | 4,148
Other income, net |  |  |  |  |  |  |  |  |  |  | (4,148)
Other expense, net |  |  |  |  |  |  |  |  | (1,253) | (3,029) |
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 61,638 | (414,214) | (715,525)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 61,638 | (414,214) | (715,525)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 61,638 | (414,214) | (715,525)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 61,638 | (414,214) | (715,525)
Guarantor/Parent | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating costs and other |  |  |  |  |  |  |  |  | 13,145 | 10,875 | 10,763
Operating income (loss) from continuing operations |  |  |  |  |  |  |  |  | (13,145) | (10,875) | (10,763)
Other income, net |  |  |  |  |  |  |  |  |  |  | 57
Other expense, net |  |  |  |  |  |  |  |  | (194) | (91) |
Interest expense |  |  |  |  |  |  |  |  | (375) | (159) | (42)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (47,166) | 427,342 | 713,001
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (60,880) | 416,217 | 702,253
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (4,052) | (4,210) | (4,310)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (56,828) | 420,427 | 706,563
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (56,828) | 420,427 | 706,563
Issuer Subsidiary | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,373,511 | 2,735,863 | 3,325,039
Operating costs and other |  |  |  |  |  |  |  |  | 1,358,269 | 2,037,465 | 2,291,775
Operating income (loss) from continuing operations |  |  |  |  |  |  |  |  | 15,242 | 698,398 | 1,033,264
Other income, net |  |  |  |  |  |  |  |  |  | 7,523 | 48,108
Other expense, net |  |  |  |  |  |  |  |  | (22,243) |  |
Interest expense |  |  |  |  |  |  |  |  | (20,256) | (8,955) | (3,049)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (14,472) | (13,128) | 2,524
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (41,729) | 683,838 | 1,080,847
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 5,127 | 258,536 | 370,734
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (46,856) | 425,302 | 710,113
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (46,856) | 425,302 | 710,113
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 250,791 | 425,914 | 391,081
Operating costs and other |  |  |  |  |  |  |  |  | 280,107 | 444,503 | 364,556
Operating income (loss) from continuing operations |  |  |  |  |  |  |  |  | (29,316) | (18,589) | 26,525
Other income, net |  |  |  |  |  |  |  |  |  | 536 | 2,124
Other expense, net |  |  |  |  |  |  |  |  | (98) |  |
Interest expense |  |  |  |  |  |  |  |  | (2,282) | (5,909) | (1,566)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (31,696) | (23,962) | 27,083
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (20,752) | (12,921) | 21,624
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (10,944) | (11,041) | 5,459
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  | 2,360 | (124) | 2,758
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 6,198 | (77) | 2,805
Loss from discontinued operations |  |  |  |  |  |  |  |  | (3,838) | (47) | (47)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | $ (14,782) | $ (11,088) | $ 5,412

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