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Guarantor and Non-Guarantor Financial Information - Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS          
Operating revenue $ 405,283 $ 438,191 $ 773,873 $ 926,038 $ 926,038
Operating costs and other 470,955 396,570 888,709 845,747  
Operating income (loss) from continuing operations (65,672) 41,621 (114,836) 80,291  
Other income (expense), net 1,512 1,452 2,889 1,924  
Interest expense (6,084) (5,721) (11,139) (10,245)  
Income (loss) from continuing operations before income taxes (70,244) 37,352 (123,086) 71,970  
Income tax provision (21,771) 12,178 (40,059) 30,898  
Income (loss) from continuing operations (48,473) 25,174 (83,027) 41,072  
Income (loss) from discontinued operations before income taxes (94) (56) (518) 48  
Income tax provision (benefit) 251 3,913 336 3,913  
Loss from discontinued operations (345) (3,969) (854) (3,865)  
NET INCOME (LOSS) (48,818) 21,205 (83,881) 37,207  
Eliminations          
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS          
Operating revenue (16) (16) (33) (33)  
Operating costs and other (230) (402) (461) (803)  
Operating income (loss) from continuing operations 214 386 428 770  
Other income (expense), net (214) (386) (428) (770)  
Equity in net income (loss) of subsidiaries 57,795 (15,247) 90,458 (24,599)  
Income (loss) from continuing operations before income taxes 57,795 (15,247) 90,458 (24,599)  
Income (loss) from continuing operations 57,795 (15,247) 90,458 (24,599)  
NET INCOME (LOSS) 57,795 (15,247) 90,458 (24,599)  
Guarantor/Parent | Reportable Legal Entities          
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS          
Operating costs and other 3,300 3,156 6,760 5,861  
Operating income (loss) from continuing operations (3,300) (3,156) (6,760) (5,861)  
Other income (expense), net 1 (271) 1 (251)  
Interest expense (87) (62) (173) (124)  
Equity in net income (loss) of subsidiaries (46,677) 23,065 (79,669) 40,614  
Income (loss) from continuing operations before income taxes (50,063) 19,576 (86,601) 34,378  
Income tax provision (1,245) (1,629) (2,720) (2,829)  
Income (loss) from continuing operations (48,818) 21,205 (83,881) 37,207  
NET INCOME (LOSS) (48,818) 21,205 (83,881) 37,207  
Issuer Subsidiary | Reportable Legal Entities          
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS          
Operating revenue 367,202 382,747 664,650 788,284  
Operating costs and other 415,544 331,998 755,046 688,749  
Operating income (loss) from continuing operations (48,342) 50,749 (90,396) 99,535  
Other income (expense), net 1,814 734 2,833 1,390  
Interest expense (5,148) (5,272) (9,857) (9,990)  
Equity in net income (loss) of subsidiaries (11,118) (7,818) (10,789) (16,015)  
Income (loss) from continuing operations before income taxes (62,794) 38,393 (108,209) 74,920  
Income tax provision (17,410) 15,657 (29,960) 34,884  
Income (loss) from continuing operations (45,384) 22,736 (78,249) 40,036  
NET INCOME (LOSS) (45,384) 22,736 (78,249) 40,036  
Non-Guarantor Subsidiaries | Reportable Legal Entities          
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS          
Operating revenue 38,097 55,460 109,256 137,787  
Operating costs and other 52,341 61,818 127,364 151,940  
Operating income (loss) from continuing operations (14,244) (6,358) (18,108) (14,153)  
Other income (expense), net (89) 1,375 483 1,555  
Interest expense (849) (387) (1,109) (131)  
Income (loss) from continuing operations before income taxes (15,182) (5,370) (18,734) (12,729)  
Income tax provision (3,116) (1,850) (7,379) (1,157)  
Income (loss) from continuing operations (12,066) (3,520) (11,355) (11,572)  
Income (loss) from discontinued operations before income taxes (94) (56) (518) 48  
Income tax provision (benefit) 251 3,913 336 3,913  
Loss from discontinued operations (345) (3,969) (854) (3,865)  
NET INCOME (LOSS) $ (12,411) $ (7,489) $ (12,209) $ (15,437)