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Guarantor and Non-Guarantor Financial Information - Income Statement (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
CONDENSED CONSOLIDATING STATEMENTS OF INCOME |  |  |  |
Operating revenues | $ 438,191 | $ 885,670 | $ 926,038 | $ 1,946,457
Operating costs and other | 396,570 | 654,344 | 845,747 | 1,384,760
Operating income (loss) from continuing operations | 41,621 | 231,326 | 80,291 | 561,697
Other income (loss), net | 1,452 | 2,619 | 1,924 | 3,228
Interest expense | (5,721) | (2,600) | (10,245) | (3,190)
Income (loss) from continuing operations before income taxes | 37,352 | 231,345 | 71,970 | 561,735
Income tax provision | 12,178 | 77,803 | 30,898 | 204,570
Income (loss) from continuing operations | 25,174 | 153,542 | 41,072 | 357,165
Income (loss) from discontinued operations before income taxes | (56) | (76) | 48 | (91)
Income tax provision | 3,913 | (77) | 3,913 | (77)
Income (loss) from discontinued operations | (3,969) | 1 | (3,865) | (14)
NET INCOME | 21,205 | 153,543 | 37,207 | 357,151
Eliminations |  |  |  |
CONDENSED CONSOLIDATING STATEMENTS OF INCOME |  |  |  |
Operating revenues | (16) | (24) | (33) | (40)
Operating costs and other | (402) | (1,034) | (803) | (2,066)
Operating income (loss) from continuing operations | 386 | 1,010 | 770 | 2,026
Other income (loss), net | (386) | (1,010) | (770) | (2,026)
Equity in net income (loss) of subsidiaries | (15,247) | (159,079) | (24,599) | (371,156)
Income (loss) from continuing operations before income taxes | (15,247) | (159,079) | (24,599) | (371,156)
Income (loss) from continuing operations | (15,247) | (159,079) | (24,599) | (371,156)
NET INCOME | (15,247) | (159,079) | (24,599) | (371,156)
Guarantor/Parent | Reportable Legal Entities |  |  |  |
CONDENSED CONSOLIDATING STATEMENTS OF INCOME |  |  |  |
Operating costs and other | 3,156 | 3,059 | 5,861 | 6,080
Operating income (loss) from continuing operations | (3,156) | (3,059) | (5,861) | (6,080)
Other income (loss), net | (271) | 2 | (251) | 3
Interest expense | (62) | (12) | (124) | (19)
Equity in net income (loss) of subsidiaries | 23,065 | 155,706 | 40,614 | 361,065
Income (loss) from continuing operations before income taxes | 19,576 | 152,637 | 34,378 | 354,969
Income tax provision | (1,629) | (906) | (2,829) | (2,182)
Income (loss) from continuing operations | 21,205 | 153,543 | 37,207 | 357,151
NET INCOME | 21,205 | 153,543 | 37,207 | 357,151
Issuer Subsidiary | Reportable Legal Entities |  |  |  |
CONDENSED CONSOLIDATING STATEMENTS OF INCOME |  |  |  |
Operating revenues | 382,747 | 774,896 | 788,284 | 1,727,005
Operating costs and other | 331,998 | 548,083 | 688,749 | 1,177,121
Operating income (loss) from continuing operations | 50,749 | 226,813 | 99,535 | 549,884
Other income (loss), net | 734 | 3,738 | 1,390 | 4,659
Interest expense | (5,272) |  | (9,990) | (103)
Interest income (expense) |  | (121) |  |
Equity in net income (loss) of subsidiaries | (7,818) | 3,373 | (16,015) | 10,091
Income (loss) from continuing operations before income taxes | 38,393 | 233,803 | 74,920 | 564,531
Income tax provision | 15,657 | 78,923 | 34,884 | 205,045
Income (loss) from continuing operations | 22,736 | 154,880 | 40,036 | 359,486
NET INCOME | 22,736 | 154,880 | 40,036 | 359,486
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |
CONDENSED CONSOLIDATING STATEMENTS OF INCOME |  |  |  |
Operating revenues | 55,460 | 110,798 | 137,787 | 219,492
Operating costs and other | 61,818 | 104,236 | 151,940 | 203,625
Operating income (loss) from continuing operations | (6,358) | 6,562 | (14,153) | 15,867
Other income (loss), net | 1,375 | (111) | 1,555 | 592
Interest expense | (387) | (2,467) | (131) | (3,068)
Income (loss) from continuing operations before income taxes | (5,370) | 3,984 | (12,729) | 13,391
Income tax provision | (1,850) | (214) | (1,157) | 1,707
Income (loss) from continuing operations | (3,520) | 4,198 | (11,572) | 11,684
Income (loss) from discontinued operations before income taxes | (56) | (76) | 48 | (91)
Income tax provision | 3,913 | (77) | 3,913 | (77)
Income (loss) from discontinued operations | (3,969) | 1 | (3,865) | (14)
NET INCOME | $ (7,489) | $ 4,199 | $ (15,437) | $ 11,670

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