UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
OPERATING REVENUES
Drilling services	$ 674,565	$ 717,170
Other	2,582	2,467
Total operating revenues	677,147	719,637
OPERATING COSTS AND EXPENSES
Drilling services operating expenses, excluding depreciation and amortization	403,303	428,251
Other operating expenses	1,137	1,126
Depreciation and amortization	93,991	96,655
Research and development	8,608	6,933
Selling, general and administrative	56,577	48,455
Asset impairment charges	0	12,097
Gain on reimbursement of drilling equipment	(7,494)	(15,724)
Other gain on sale of assets	2,443	2,379
Total operating costs and expenses	553,679	575,414
OPERATING INCOME	123,468	144,223
Other income (expense)
Interest and dividend income	10,734	4,705
Interest expense	(4,372)	(4,355)
Loss on investment securities	(4,034)	(15,091)
Other	(543)	58
Total unallocated amounts	1,785	(14,683)
Income before income taxes	125,253	129,540
Income tax expense	30,080	32,395
NET INCOME	$ 95,173	$ 97,145
Basic earnings per common share
Net income (loss) (in dollars per share)	$ 0.95	$ 0.92
Diluted earnings per common share:
Net income (in dollars per share)	$ 0.94	$ 0.91
Weighted average shares outstanding:
Basic (in shares)	99,143	105,248
Diluted (in shares)	99,628	106,104