UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 97,145	$ (51,362)
Adjustment for (income) loss from discontinued operations	(718)	31
Income (loss) from continuing operations	96,427	(51,331)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	96,655	100,437
Asset impairment charges	12,097	4,363
Amortization of debt discount and debt issuance costs	322	239
Loss on extinguishment of debt	0	60,083
Provision for credit loss	3,358	(112)
Stock-based compensation	8,273	6,218
(Gain) loss on investment securities	15,091	(47,862)
Gain on reimbursement of drilling equipment	(15,724)	(5,254)
Other (gain) loss on sale of assets	(2,379)	1,029
Deferred income tax expense (benefit)	188	(17,750)
Other	7,692	(4,489)
Change in assets and liabilities:
Accounts receivable	(57,896)	(54,641)
Inventories of materials and supplies	(3,007)	(2,507)
Prepaid expenses and other	(8,676)	4,099
Other noncurrent assets	(1,746)	3,930
Accounts payable	10,450	36,041
Accrued liabilities	20,759	(17,592)
Deferred income tax liability	(711)	69
Other noncurrent liabilities	4,224	(18,675)
Net cash provided by (used in) operating activities from continuing operations	185,397	(3,705)
Net cash used in operating activities from discontinued operations	(22)	(13)
Net cash provided by (used in) operating activities	185,375	(3,718)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(96,027)	(44,014)
Other capital expenditures related to assets held-for-sale	0	(3,877)
Purchase of short-term investments	(41,641)	(47,083)
Purchase of long-term investments	(16,237)	(9,015)
Proceeds from sale of short-term investments	40,758	37,777
Proceeds from asset sales	30,978	21,483
Net cash used in investing activities	(82,169)	(44,729)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(51,764)	(27,320)
Payments for employee taxes on net settlement of equity awards	(9,483)	(4,113)
Payment of contingent consideration from acquisition of business	(250)	(250)
Payments for early extinguishment of long-term debt	0	(487,148)
Make-whole premium payment	0	(56,421)
Share repurchases	(39,060)	(60,358)
Net cash used in financing activities	(100,557)	(635,610)
Net increase (decrease) in cash and cash equivalents and restricted cash	2,649	(684,057)
Cash and cash equivalents and restricted cash, beginning of period	269,009	936,716
Cash and cash equivalents and restricted cash, end of period	271,658	252,659
Cash paid (received) during the period:
Interest paid	915	2,673
Income tax paid (received), net	(21,876)	97
Payments for operating leases	2,474	3,657
Non-cash operating and investing activities:
Change in accounts payable and accrued liabilities related to purchases of property, plant and equipment	$ (650)	$ (1,820)