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Guarantor and Non-Guarantor Financial Information - Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS    
Operating revenue $ 564,087 $ 368,590
Operating costs and other 560,567 417,754
Operating income (loss) from continuing operations 3,520 (49,164)
Other income (expense), net 2,254 1,377
Interest expense (5,773) (5,055)
Income (loss) from continuing operations before income taxes 1 (52,842)
Income tax expense (benefit) (500,641) (18,288)
Income (loss) from continuing operations 500,642 (34,554)
Income (loss) from discontinued operations before income taxes (519) (424)
Income tax provision 17 85
Loss from discontinued operations (536) (509)
Net income (loss) 500,106 (35,063)
Eliminations    
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS    
Operating revenue (16) (17)
Operating costs and other (205) (231)
Operating income (loss) from continuing operations 189 214
Other income (expense), net (189) (214)
Equity in net income (loss) of subsidiaries (528,785) 32,663
Income (loss) from continuing operations before income taxes (528,785) 32,663
Income (loss) from continuing operations (528,785) 32,663
Net income (loss) (528,785) 32,663
Guarantor/Parent | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS    
Operating costs and other 4,178 3,460
Operating income (loss) from continuing operations (4,178) (3,460)
Other income (expense), net 261  
Interest expense (28) (86)
Equity in net income (loss) of subsidiaries 507,420 (32,992)
Income (loss) from continuing operations before income taxes 503,475 (36,538)
Income tax expense (benefit) 3,369 (1,475)
Income (loss) from continuing operations 500,106 (35,063)
Net income (loss) 500,106 (35,063)
Issuer Subsidiary | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS    
Operating revenue 495,006 297,448
Operating costs and other 481,648 339,502
Operating income (loss) from continuing operations 13,358 (42,054)
Other income (expense), net 1,641 1,019
Interest expense (5,700) (4,709)
Equity in net income (loss) of subsidiaries 21,365 329
Income (loss) from continuing operations before income taxes 30,664 (45,415)
Income tax expense (benefit) (478,594) (12,550)
Income (loss) from continuing operations 509,258 (32,865)
Net income (loss) 509,258 (32,865)
Non-Guarantor Subsidiaries | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS    
Operating revenue 69,097 71,159
Operating costs and other 74,946 75,023
Operating income (loss) from continuing operations (5,849) (3,864)
Other income (expense), net 541 572
Interest expense (45) (260)
Income (loss) from continuing operations before income taxes (5,353) (3,552)
Income tax expense (benefit) (25,416) (4,263)
Income (loss) from continuing operations 20,063 711
Income (loss) from discontinued operations before income taxes (519) (424)
Income tax provision 17 85
Loss from discontinued operations (536) (509)
Net income (loss) $ 19,527 $ 202