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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating Activities:    
Net income $ 103,796 $ 28,090
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 5,074 6,500
Stock-based compensation 3,820 3,914
Unrealized mark-to-market gain on derivative contracts (113) 0
Bad debt expense, net 294 36
Deferred income taxes (148) (2,551)
Changes in operating assets and liabilities:    
Accounts receivable, net 33,099 (96,986)
Contract assets and liabilities, net (27,304) 178,161
Inventories (21,254) (15,304)
Income taxes 1,037 (11)
Prepaid expenses and other current assets (374) (1,981)
Accounts payable 22,415 (249)
Accrued liabilities (4,337) 3,528
Other, net (1,353) 2,167
Net cash provided by operating activities 114,652 105,314
Investing Activities:    
Purchases of short-term investments (27,537) (18,789)
Maturities of short-term investments 18,312 7,385
Purchases of property, plant and equipment (3,527) (4,006)
Purchase of intangible assets (250) 0
Proceeds from sale of property, plant and equipment 26 12
Net cash used in investing activities (12,976) (15,398)
Financing Activities:    
Shares withheld in lieu of employee tax withholding (6,476) (582)
Dividends paid (9,475) (9,292)
Net cash used in financing activities (15,951) (9,874)
Net increase in cash and cash equivalents 85,725 80,042
Effect of exchange rate changes on cash and cash equivalents 412 1,359
Cash and cash equivalents at beginning of period 245,875 101,954
Cash and cash equivalents at end of period $ 332,012 $ 183,355