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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income (loss) | $ 434,100 | $ 6,953 | $ (326,150)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization | 382,314 | 403,170 | 419,726
Asset impairment charges | 12,097 | 4,363 | 70,850
Amortization of debt discount and debt issuance costs | 1,079 | 1,200 | 1,423
Loss on extinguishment of debt | 0 | 60,083 | 0
Stock-based compensation | 32,456 | 28,032 | 27,858
Gain on investment securities | (11,299) | (57,937) | (6,727)
Gain on reimbursement of drilling equipment | (48,173) | (29,443) | (12,322)
Other (gain) loss on sale of assets | 8,016 | (5,432) | 11,280
Deferred income tax benefit | (20,400) | (28,488) | (89,752)
Other | 8,979 | 7,140 | 2,640
Change in assets and liabilities: |  |  |
Accounts receivable | 56,281 | (235,562) | (28,416)
Inventories of materials and supplies | (7,826) | (5,228) | 19,847
Prepaid expenses and other | (1,803) | 6,224 | (21,400)
Other noncurrent assets | (11,135) | 2,581 | 2,772
Accounts payable | 4,237 | 53,242 | 31,027
Accrued liabilities | (10,139) | 45,069 | 33,957
Deferred income tax liability | (692) | 447 | 1,101
Other noncurrent liabilities | 5,590 | (22,501) | (1,274)
Net cash provided by operating activities | 833,682 | 233,913 | 136,440
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Capital expenditures | (395,460) | (250,894) | (82,148)
Other capital expenditures related to assets held-for-sale | 0 | (21,645) | 0
Purchase of short-term investments | (180,993) | (165,109) | (315,078)
Purchase of long-term investments | (20,748) | (51,241) | (102,523)
Proceeds from sale of short-term investments | 195,311 | 244,728 | 207,716
Proceeds from sale of long-term investments | 0 | 22,042 | 0
Proceeds from asset sales | 70,085 | 62,304 | 43,515
Insurance proceeds from involuntary conversion | 9,221 | 0 | 0
Advance payment for sale of property, plant and equipment | 0 | 0 | 86,524
Other | 0 | (7,500) | 0
Net cash used in investing activities | (322,584) | (167,315) | (161,994)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Dividends paid | (201,456) | (107,395) | (109,130)
Proceeds from debt issuance | 0 | 0 | 548,719
Debt issuance costs | 0 | 0 | (3,935)
Payments for employee taxes on net settlement of equity awards | (14,410) | (5,505) | (2,162)
Payment of contingent consideration from acquisition of business | (250) | (250) | (7,250)
Payments for early extinguishment of long-term debt | 0 | (487,148) | 0
Make-whole premium payment | 0 | (56,421) | 0
Share repurchases | (247,213) | (76,999) | 0
Other | (540) | (587) | (719)
Net cash provided by (used in) financing activities | (463,869) | (734,305) | 425,523
Net increase (decrease) in cash and cash equivalents and restricted cash | 47,229 | (667,707) | 399,969
Cash and cash equivalents and restricted cash, beginning of period | 269,009 | 936,716 | 536,747
Cash and cash equivalents and restricted cash, end of period | 316,238 | 269,009 | 936,716
Cash paid (received) during the period: |  |  |
Interest paid | 17,099 | 18,909 | 26,706
Income tax paid | 199,139 | 17,731 | 1,456
Income tax received | (26,809) | (62) | (33,918)
Payments for operating leases | 12,441 | 11,233 | 17,266
Non-cash operating and investing activities: |  |  |
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment | (2,554) | (2,425) | (1,526)
Changes in accounts receivable, property, plant and equipment and other noncurrent assets related to the sale of equipment | 0 | 0 | 9,290
Cumulative effect adjustment for adoption of ASU No. 2016-13 | $ 0 | $ 0 | $ (1,251)

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