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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
OPERATING REVENUES        
Drilling services $ 685,131,000 $ 766,682,000 $ 1,359,696,000 $ 1,483,852,000
Other 2,812,000 2,540,000 5,394,000 5,007,000
Total operating revenues 687,943,000 769,222,000 1,365,090,000 1,488,859,000
OPERATING COSTS AND EXPENSES        
Drilling services operating expenses, excluding depreciation and amortization 401,851,000 449,110,000 805,154,000 877,361,000
Other operating expenses 1,026,000 1,188,000 2,163,000 2,314,000
Depreciation and amortization 104,545,000 96,255,000 198,536,000 192,910,000
Research and development 12,942,000 8,702,000 21,550,000 15,635,000
Selling, general and administrative 62,037,000 52,855,000 118,614,000 101,310,000
Asset impairment charges 0 0 0 12,097,000
Gain on reimbursement of drilling equipment (7,461,000) (11,574,000) (14,955,000) (27,298,000)
Other (gain) loss on sale of assets (2,431,000) 2,519,000 12,000 4,898,000
Total operating costs and expenses 577,371,000 594,017,000 1,131,050,000 1,169,431,000
OPERATING INCOME 110,572,000 175,205,000 234,040,000 319,428,000
Other income (expense)        
Interest and dividend income 6,567,000 5,055,000 17,301,000 9,760,000
Interest expense (4,261,000) (4,239,000) (8,633,000) (8,594,000)
Gain (loss) on investment securities 3,747,000 39,752,000 (287,000) 24,661,000
Other 400,000 (604,000) (143,000) (546,000)
Total unallocated amounts 6,453,000 39,964,000 8,238,000 25,281,000
Income before income taxes 117,025,000 215,169,000 242,278,000 344,709,000
Income tax expense 32,194,000 51,129,000 62,274,000 83,524,000
NET INCOME $ 84,831,000 $ 164,040,000 $ 180,004,000 $ 261,185,000
Basic earnings per common share        
Net income (loss) (in dollars per share) $ 0.85 $ 1.55 $ 1.79 $ 2.46
Diluted earnings per common share:        
Net income (in dollars per share) $ 0.84 $ 1.55 $ 1.79 $ 2.46
Weighted average shares outstanding:        
Basic (in shares) 98,774 103,968 98,960 104,615
Diluted (in shares) 99,046 104,363 99,216 105,003