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Guarantor and Non-Guarantor Financial Information - Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS        
Operating revenues $ 366,486 $ 661,445 $ 1,292,524 $ 2,607,902
Operating costs and other 379,742 526,396 1,225,489 1,911,156
Operating income (loss) from continuing operations (13,256) 135,049 67,035 696,746
Other income (expense), net 1,312 1,307 3,236 4,535
Interest expense (6,407) (6,136) (16,652) (9,326)
Income (loss) from continuing operations before income taxes (18,351) 130,220 53,619 691,955
Income tax provision 2,842 39,321 33,740 243,891
Income (loss) from continuing operations (21,193) 90,899 19,879 448,064
Income (loss) from discontinued operations before income taxes 2,193 (27) 2,241 (118)
Income tax provision 2,200   6,113 (77)
Loss from discontinued operations (7) (27) (3,872) (41)
NET INCOME (LOSS) (21,200) 90,872 16,007 448,023
Eliminations        
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS        
Operating revenues (20) (18) (53) (58)
Operating costs and other (290) (1,026) (1,093) (3,092)
Operating income (loss) from continuing operations 270 1,008 1,040 3,034
Other income (expense), net (270) (1,007) (1,040) (3,033)
Equity in net income (loss) of subsidiaries 26,368 (105,453) 1,769 (476,609)
Income (loss) from continuing operations before income taxes 26,368 (105,452) 1,769 (476,608)
Income (loss) from continuing operations 26,368 (105,452) 1,769 (476,608)
NET INCOME (LOSS) 26,368 (105,452) 1,769 (476,608)
Guarantor/Parent | Reportable Legal Entities        
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS        
Operating costs and other 3,712 3,072 9,573 9,152
Operating income (loss) from continuing operations (3,712) (3,072) (9,573) (9,152)
Other income (expense), net 16 (103) (235) (100)
Interest expense (62) (40) (186) (59)
Equity in net income (loss) of subsidiaries (18,572) 92,413 22,042 453,478
Income (loss) from continuing operations before income taxes (22,330) 89,198 12,048 444,167
Income tax provision (1,130) (1,674) (3,959) (3,856)
Income (loss) from continuing operations (21,200) 90,872 16,007 448,023
NET INCOME (LOSS) (21,200) 90,872 16,007 448,023
Issuer Subsidiary | Reportable Legal Entities        
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS        
Operating revenues 315,077 543,834 1,103,361 2,270,839
Operating costs and other 314,620 423,409 1,003,369 1,600,530
Operating income (loss) from continuing operations 457 120,425 99,992 670,309
Other income (expense), net 1,290 1,565 2,680 6,224
Interest expense (5,597) (4,638) (15,587) (4,741)
Equity in net income (loss) of subsidiaries (7,796) 13,040 (23,811) 23,131
Income (loss) from continuing operations before income taxes (11,646) 130,392 63,274 694,923
Income tax provision 7,230 38,941 42,114 243,986
Income (loss) from continuing operations (18,876) 91,451 21,160 450,937
NET INCOME (LOSS) (18,876) 91,451 21,160 450,937
Non-Guarantor Subsidiaries | Reportable Legal Entities        
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS        
Operating revenues 51,429 117,629 189,216 337,121
Operating costs and other 61,700 100,941 213,640 304,566
Operating income (loss) from continuing operations (10,271) 16,688 (24,424) 32,555
Other income (expense), net 276 852 1,831 1,444
Interest expense (748) (1,458) (879) (4,526)
Income (loss) from continuing operations before income taxes (10,743) 16,082 (23,472) 29,473
Income tax provision (3,258) 2,054 (4,415) 3,761
Income (loss) from continuing operations (7,485) 14,028 (19,057) 25,712
Income (loss) from discontinued operations before income taxes 2,193 (27) 2,241 (118)
Income tax provision 2,200   6,113 (77)
Loss from discontinued operations (7) (27) (3,872) (41)
NET INCOME (LOSS) $ (7,492) $ 14,001 $ (22,929) $ 25,671