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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
OPERATING REVENUES      
Drilling services $ 2,746,128,000 $ 2,862,677,000 $ 2,049,841,000
Other 10,479,000 9,744,000 9,103,000
Total operating revenues 2,756,607,000 2,872,421,000 2,058,944,000
OPERATING COSTS AND EXPENSES      
Drilling services operating expenses, excluding depreciation and amortization 1,630,225,000 1,715,098,000 1,426,589,000
Other operating expenses 4,483,000 4,477,000 4,638,000
Depreciation and amortization 397,344,000 382,314,000 403,170,000
Research and development 40,967,000 30,046,000 26,563,000
Selling, general and administrative 244,877,000 206,657,000 182,366,000
Asset impairment charges 0 12,097,000 4,363,000
Restructuring charges 0 0 838,000
Acquisition transaction costs 14,982,000 0 0
Gain on reimbursement of drilling equipment (33,309,000) (48,173,000) (29,443,000)
Other (gain) loss on sale of assets 5,139,000 8,016,000 (5,432,000)
Total operating costs and expenses 2,304,708,000 2,310,532,000 2,013,652,000
OPERATING INCOME 451,899,000 561,889,000 45,292,000
Other income (expense)      
Interest and dividend income 41,168,000 28,393,000 18,090,000
Interest expense (29,093,000) (17,283,000) (19,203,000)
Gain on investment securities 13,953,000 11,299,000 57,937,000
Loss on extinguishment of debt 0 0 (60,083,000)
Other 3,093,000 9,081,000 (10,714,000)
Total unallocated amounts 29,121,000 31,490,000 (13,973,000)
Income before income taxes 481,020,000 593,379,000 31,319,000
Income tax expense 136,855,000 159,279,000 24,366,000
NET INCOME $ 344,165,000 $ 434,100,000 $ 6,953,000
Basic earnings per common share (in dollars per share) $ 3.43 $ 4.18 $ 0.05
Diluted earnings per common share $ 3.43 $ 4.16 $ 0.05
Weighted average shares outstanding:      
Basic (in shares) 98,857 102,447 105,891
Diluted (in shares) 99,067 102,852 106,555