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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
OPERATING REVENUES      
Drilling services $ 1,210,800 $ 1,761,714 $ 2,785,557
Other 7,768 12,213 12,933
Total operating revenues 1,218,568 1,773,927 2,798,490
OPERATING COSTS AND EXPENSES      
Drilling services operating expenses, excluding depreciation and amortization 952,600 1,184,788 1,803,204
Other operating expenses 5,138 5,777 5,382
Depreciation and amortization 419,726 481,885 562,803
Research and development 21,724 21,645 27,467
Selling, general and administrative 172,195 167,513 194,416
Asset impairment charge 70,850 563,234 224,327
Restructuring charges 5,926 16,047 0
Gain on sale of assets (1,042) (46,775) (39,691)
Total operating costs and expenses 1,647,117 2,394,114 2,777,908
OPERATING INCOME (LOSS) FROM CONTINUING OPERATIONS (428,549) (620,187) 20,582
Other income (expense)      
Interest and dividend income 10,254 7,304 9,468
Interest expense (23,955) (24,474) (25,188)
Gain (loss) on investment securities 6,727 (8,720) (54,488)
Gain on sale of subsidiary 0 14,963 0
Other (5,657) (5,384) (1,596)
Total other income (expense) (12,631) (16,311) (71,804)
Loss from continuing operations before income taxes (441,180) (636,498) (51,222)
Income tax benefit (103,721) (140,106) (18,712)
Loss from continuing operations (337,459) (496,392) (32,510)
Income from discontinued operations before income taxes 11,309 30,580 32,848
Income tax provision 0 28,685 33,994
Income (loss) from discontinued operations 11,309 1,895 (1,146)
NET LOSS $ (326,150) $ (494,497) $ (33,656)
Basic earnings (loss) per common share:      
Loss from continuing operations (in dollars per share) $ (3.14) $ (4.62) $ (0.33)
Income (loss) from discontinued operations (in dollars per share) 0.10 0.02 (0.01)
Net loss (in dollars per share) (3.04) (4.60) (0.34)
Diluted earnings (loss) per common share:      
Loss from continuing operations (in dollars per share) (3.14) (4.62) (0.33)
Income (loss) from discontinued operations (in dollars per share) 0.10 0.02 (0.01)
Net loss (in dollars per share) $ (3.04) $ (4.60) $ (0.34)
Weighted average shares outstanding:      
Basic (in shares) 107,818 108,009 109,216
Diluted (in shares) 107,818 108,009 109,216