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Guarantor and Non-Guarantor Financial Information - Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS        
Operating revenue $ 577,484 $ 405,283 $ 1,141,571 $ 773,873
Operating costs and other 578,737 470,955 1,139,304 888,709
Operating income (loss) from continuing operations (1,253) (65,672) 2,267 (114,836)
Other income (expense), net 1,726 1,512 3,980 2,889
Interest expense (6,028) (6,084) (11,801) (11,139)
Loss from continuing operations before income taxes (5,555) (70,244) (5,554) (123,086)
Income tax expense (benefit) (3,922) (21,771) (504,563) (40,059)
Income (loss) from continuing operations (1,633) (48,473) 499,009 (83,027)
Income (loss) from discontinued operations before income taxes 1,263 (94) 744 (518)
Income tax provision 11,509 251 11,526 336
Loss from discontinued operations (10,246) (345) (10,782) (854)
Net income (loss) (11,879) (48,818) 488,227 (83,881)
Eliminations        
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS        
Operating revenue (21) (16) (37) (33)
Operating costs and other (246) (230) (451) (461)
Operating income (loss) from continuing operations 225 214 414 428
Other income (expense), net (225) (214) (414) (428)
Equity in net income (loss) of subsidiaries 24,044 57,795 (504,741) 90,458
Loss from continuing operations before income taxes 24,044 57,795 (504,741) 90,458
Income (loss) from continuing operations 24,044 57,795 (504,741) 90,458
Net income (loss) 24,044 57,795 (504,741) 90,458
Guarantor/Parent | Reportable Legal Entities        
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS        
Operating costs and other 4,209 3,300 8,387 6,760
Operating income (loss) from continuing operations (4,209) (3,300) (8,387) (6,760)
Other income (expense), net 19 1 280 1
Interest expense (138) (87) (166) (173)
Equity in net income (loss) of subsidiaries (7,963) (46,677) 499,457 (79,669)
Loss from continuing operations before income taxes (12,291) (50,063) 491,184 (86,601)
Income tax expense (benefit) (411) (1,245) 2,958 (2,720)
Income (loss) from continuing operations (11,880) (48,818) 488,226 (83,881)
Net income (loss) (11,880) (48,818) 488,226 (83,881)
Issuer Subsidiary | Reportable Legal Entities        
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS        
Operating revenue 515,712 367,202 1,010,718 664,650
Operating costs and other 503,173 415,544 984,821 755,046
Operating income (loss) from continuing operations 12,539 (48,342) 25,897 (90,396)
Other income (expense), net 1,732 1,814 3,373 2,833
Interest expense (4,551) (5,148) (10,251) (9,857)
Equity in net income (loss) of subsidiaries (16,081) (11,118) 5,284 (10,789)
Loss from continuing operations before income taxes (6,361) (62,794) 24,303 (108,209)
Income tax expense (benefit) 1,639 (17,410) (476,955) (29,960)
Income (loss) from continuing operations (8,000) (45,384) 501,258 (78,249)
Net income (loss) (8,000) (45,384) 501,258 (78,249)
Non-Guarantor Subsidiaries | Reportable Legal Entities        
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS        
Operating revenue 61,793 38,097 130,890 109,256
Operating costs and other 71,601 52,341 146,547 127,364
Operating income (loss) from continuing operations (9,808) (14,244) (15,657) (18,108)
Other income (expense), net 200 (89) 741 483
Interest expense (1,339) (849) (1,384) (1,109)
Loss from continuing operations before income taxes (10,947) (15,182) (16,300) (18,734)
Income tax expense (benefit) (5,150) (3,116) (30,566) (7,379)
Income (loss) from continuing operations (5,797) (12,066) 14,266 (11,355)
Income (loss) from discontinued operations before income taxes 1,263 (94) 744 (518)
Income tax provision 11,509 251 11,526 336
Loss from discontinued operations (10,246) (345) (10,782) (854)
Net income (loss) $ (16,043) $ (12,411) $ 3,484 $ (12,209)