CONSOLIDATED CONDENSED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Operating revenues:
Drilling - U.S. Land	$ 349,283	$ 718,463	$ 719,088	$ 1,608,510
Drilling - Offshore	34,325	62,428	76,205	132,315
Drilling - International Land	51,352	101,038	123,546	197,711
Other	3,231	3,741	7,199	7,921
Total operating revenues	438,191	885,670	926,038	1,946,457
Operating costs and other:
Operating costs, excluding depreciation	221,611	467,099	498,255	1,026,562
Depreciation	141,517	150,248	283,646	288,480
General and administrative	33,811	34,995	65,885	67,731
Research and development	2,315	4,857	5,234	9,015
Income from asset sales	(2,684)	(2,855)	(7,273)	(7,028)
Total operating costs and expenses	396,570	654,344	845,747	1,384,760
Operating income (loss) from continuing operations	41,621	231,326	80,291	561,697
Other income (expense):
Interest and dividend income	799	2,564	1,532	2,859
Interest expense	(5,721)	(2,600)	(10,245)	(3,190)
Other	653	55	392	369
Total other income (expense)	(4,269)	19	(8,321)	38
Income (loss) from continuing operations before income taxes	37,352	231,345	71,970	561,735
Income tax provision	12,178	77,803	30,898	204,570
Income (loss) from continuing operations	25,174	153,542	41,072	357,165
Income (loss) from discontinued operations before income taxes	(56)	(76)	48	(91)
Income tax provision	3,913	(77)	3,913	(77)
Income (loss) from discontinued operations	(3,969)	1	(3,865)	(14)
NET INCOME	$ 21,205	$ 153,543	$ 37,207	$ 357,151
Basic earnings per common share:
Income from continuing operations (in dollars per share)	$ 0.23	$ 1.42	$ 0.38	$ 3.29
Loss from discontinued operations (in dollars per share)	(0.04)		(0.04)
Net income (in dollars per share)	0.19	1.42	0.34	3.29
Diluted earnings per common share:
Income from continuing operations (in dollars per share)	0.23	1.41	0.37	3.27
Loss from discontinued operations (in dollars per share)	(0.04)		(0.04)
Net income (in dollars per share)	$ 0.19	$ 1.41	$ 0.33	$ 3.27
Weighted average shares outstanding (in thousands):
Basic (in shares)	108,014	107,646	107,933	107,812
Diluted (in shares)	108,466	108,370	108,430	108,620
Dividends declared, per share (in dollars per share)	$ 0.6875	$ 0.6875	$ 1.375	$ 1.3750