Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating revenues
Operating revenues	$ 687,974	$ 648,872	$ 2,149,440	$ 1,790,443
Operating costs and expenses
Contract drilling operating expenses, excluding depreciation and amortization	443,114	443,087	1,372,426	1,199,422
Operating expenses applicable to other revenues	1,414	1,424	4,308	3,728
Depreciation and amortization	143,297	144,579	427,917	433,521
Asset impairment charge	224,327	0	224,327	0
Research and development	7,066	5,479	21,347	13,149
Selling, general and administrative	46,590	52,310	144,604	147,005
Gain on sale of assets	(9,960)	(4,313)	(27,050)	(15,133)
Total operating costs and expenses	855,848	642,566	2,167,879	1,781,692
Operating income (loss) from continuing operations	(167,874)	6,306	(18,439)	8,751
Operating income (loss) from continuing operations
Interest and dividend income	2,349	2,109	6,861	5,680
Interest expense	(6,257)	(5,993)	(17,145)	(17,794)
Loss on investment securities	(13,271)	0	(50,228)	0
Other	(1,599)	(61)	(1,051)	170
Total other income (expense)	(18,778)	(3,945)	(61,563)	(11,944)
Income (loss) from continuing operations before income taxes	(186,652)	2,361	(80,002)	(3,193)
Income tax provision (benefit)	(32,031)	10,535	(5,602)	(494,028)
Income (loss) from continuing operations	(154,621)	(8,174)	(74,400)	490,835
Income from discontinued operations before income taxes	7,244	8,383	22,798	9,127
Income tax provision	7,306	8,217	23,231	19,743
Income (loss) from discontinued operations	(62)	166	(433)	(10,616)
Net income (loss)	$ (154,683)	$ (8,008)	$ (74,833)	$ 480,219
Basic earnings (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ (1.42)	$ (0.08)	$ (0.71)	$ 4.47
Loss from discontinued operations (in dollars per share)	0	0	0	(0.10)
Net income (loss) (in dollars per share)	(1.42)	(0.08)	(0.71)	4.37
Diluted earnings (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	(1.42)	(0.08)	(0.71)	4.45
Income (loss) from discontinued operations (in dollars per share)	0	0	0	(0.10)
Net income (loss) (in dollars per share)	$ (1.42)	$ (0.08)	$ (0.71)	$ 4.35
Weighted average shares outstanding (in thousands):
Basic (in shares)	109,425	108,905	109,324	108,818
Diluted (in shares)	109,425	108,905	109,324	109,338
Contract drilling
Operating revenues
Operating revenues	$ 684,788	$ 637,548	$ 2,139,798	$ 1,763,939
Other
Operating revenues
Operating revenues	$ 3,186	$ 11,324	$ 9,642	$ 26,504