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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Operating Activities: |  |  |
Net income | $ 149,848 | $ 54,525 | $ 13,737
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation | 6,871 | 8,606 | 9,358
Gain on sale of division | 0 | 0 | (2,006)
Stock-based compensation | 4,747 | 4,599 | 4,090
Unrealized mark-to-market gain on derivative contracts | (326) | 0 | 0
Bad debt expense, net | 278 | (54) | 162
Deferred income taxes | (7,474) | (7,847) | (4,861)
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (7,309) | (99,718) | (31,629)
Contract assets and liabilities, net | (34,714) | 227,598 | 3,122
Inventories | (21,818) | (13,276) | (21,426)
Income taxes | 2,515 | 4,812 | 688
Prepaid expenses and other current assets | (3,090) | (3,253) | (2,577)
Accounts payable | 16,346 | (6,167) | 18,594
Accrued liabilities | 5,011 | 11,729 | 8,908
Other, net | (2,224) | 999 | 258
Net cash provided by (used in) operating activities | 108,661 | 182,553 | (3,582)
Investing Activities: |  |  |
Purchases of short-term investments | (42,855) | (33,515) | (22,381)
Maturities of short-term investments | 33,107 | 14,748 | 26,320
Proceeds from sale of division | 0 | 0 | 4,348
Purchases of property, plant and equipment | (11,983) | (7,819) | (2,451)
Proceeds from sale of property, plant and equipment | 107 | 12 | 629
Purchase of intangible assets | (250) | 0 | 0
Net cash provided by (used in) investing activities | (21,874) | (26,574) | 6,465
Financing Activities: |  |  |
Payments on industrial development revenue bonds | 0 | 0 | (400)
Shares withheld in lieu of employee tax withholding | (6,599) | (652) | (675)
Dividends paid | (12,653) | (12,407) | (12,233)
Net cash used in financing activities | (19,252) | (13,059) | (13,308)
Net increase (decrease) in cash and cash equivalents | 67,535 | 142,920 | (10,425)
Effect of exchange rate changes on cash and cash equivalents | 1,921 | 1,001 | (1,935)
Cash and cash equivalents at beginning of period | 245,875 | 101,954 | 114,314
Cash and cash equivalents at end of period | $ 315,331 | $ 245,875 | $ 101,954

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