Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
OPERATING REVENUES
Drilling services	$ 465,370	$ 294,026	$ 872,904	$ 538,807
Other	2,227	2,145	4,475	3,741
Total operating revenues	467,597	296,171	877,379	542,548
OPERATING COSTS AND EXPENSES
Drilling services operating expenses, excluding depreciation and amortization	339,759	230,313	639,411	429,002
Other operating expenses	1,181	1,274	2,363	2,636
Depreciation and amortization	102,937	106,417	203,374	213,278
Research and development	6,387	5,334	12,914	10,917
Selling, general and administrative	47,051	39,349	90,766	78,652
Asset impairment charge	0	54,284	4,363	54,284
Restructuring charges	63	1,608	805	1,746
Gain on reimbursement of drilling equipment	(6,448)	(3,748)	(11,702)	(5,939)
Other (gain) loss on sale of assets	(716)	22,263	313	12,118
Total operating costs and expenses	490,214	457,094	942,607	796,694
OPERATING LOSS FROM CONTINUING OPERATIONS	(22,617)	(160,923)	(65,228)	(254,146)
Other income (expense)
Interest and dividend income	3,399	4,819	5,988	6,698
Interest expense	(4,390)	(5,759)	(10,504)	(11,898)
Gain on investment securities	22,132	2,520	69,994	5,444
Loss on extinguishment of debt	0	0	(60,083)	0
Other	(476)	(577)	(1,018)	(2,057)
Total other income (expense)	20,665	1,003	4,377	(1,813)
Loss from continuing operations before income taxes	(1,952)	(159,920)	(60,851)	(255,959)
Income tax expense (benefit)	2,672	(36,624)	(4,896)	(54,739)
Loss from continuing operations	(4,624)	(123,296)	(55,955)	(201,220)
Income (loss) from discontinued operations before income taxes	(352)	2,293	(383)	9,786
Income tax provision	0	0	0	0
Income (loss) from discontinued operations	(352)	2,293	(383)	9,786
NET LOSS	$ (4,976)	$ (121,003)	$ (56,338)	$ (191,434)
Basic earnings (loss) per common share:
Loss from continuing operations (in dollars per share)	$ (0.05)	$ (1.15)	$ (0.53)	$ (1.87)
Income from discontinued operations (in dollars per share)	0	0.02	0	0.09
Net loss (in dollars per share)	(0.05)	(1.13)	(0.53)	(1.78)
Diluted earnings (loss) per common share:
Loss from continuing operations (in dollars per share)	(0.05)	(1.15)	(0.53)	(1.87)
Income from discontinued operations (in dollars per share)	0	0.02	0	0.09
Net loss (in dollars per share)	$ (0.05)	$ (1.13)	$ (0.53)	$ (1.78)
Weighted average shares outstanding:
Basic (in shares)	105,393	107,861	106,494	107,738
Diluted (in shares)	105,393	107,861	106,494	107,738