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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
OPERATING REVENUES      
Drilling services $ 2,049,841 $ 1,210,800 $ 1,761,714
Other 9,103 7,768 12,213
Total operating revenues 2,058,944 1,218,568 1,773,927
OPERATING COSTS AND EXPENSES      
Drilling services operating expenses, excluding depreciation and amortization 1,426,589 952,600 1,184,788
Other operating expenses 4,638 5,138 5,777
Depreciation and amortization 403,170 419,726 481,885
Research and development 26,563 21,724 21,645
Selling, general and administrative 182,366 172,195 167,513
Asset impairment charges 4,363 70,850 563,234
Restructuring charges 838 5,926 16,047
Gain on reimbursement of drilling equipment (29,443) (12,322) (26,959)
Other (gain) loss on sale of assets (5,432) 11,280 (19,816)
Total operating costs and expenses 2,013,652 1,647,117 2,394,114
OPERATING INCOME (LOSS) FROM CONTINUING OPERATIONS 45,292 (428,549) (620,187)
Other income (expense)      
Interest and dividend income 18,090 10,254 7,304
Interest expense (19,203) (23,955) (24,474)
Gain (loss) on investment securities 57,937 6,727 (8,720)
Gain on sale of subsidiary 0 0 14,963
Loss on extinguishment of debt (60,083) 0 0
Other (11,115) (5,657) (5,384)
Total unallocated amounts (14,374) (12,631) (16,311)
Income (loss) from continuing operations before income taxes 30,918 (441,180) (636,498)
Income tax expense (benefit) 24,366 (103,721) (140,106)
Income (loss) from continuing operations 6,552 (337,459) (496,392)
Income from discontinued operations before income taxes 401 11,309 30,580
Income tax provision 0 0 28,685
Income from discontinued operations 401 11,309 1,895
NET INCOME (LOSS) $ 6,953 $ (326,150) $ (494,497)
Basic earnings (loss) per common share:      
Income (loss) from continuing operations (in dollars per share) $ 0.05 $ (3.14) $ (4.62)
Income from discontinued operations (in dollars per share) 0 0.10 0.02
Net income (loss) (in dollars per share) 0.05 (3.04) (4.60)
Diluted earnings (loss) per common share:      
Income (loss) from continuing operations (in dollars per share) 0.05 (3.14) (4.62)
Income from discontinued operations (in dollars per share) 0 0.10 0.02
Net income (loss) (in dollars per share) $ 0.05 $ (3.04) $ (4.60)
Weighted average shares outstanding:      
Basic (in shares) 105,891 107,818 108,009
Diluted (in shares) 106,555 107,818 108,009