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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Operating Activities:      
Net income $ 180,747 $ 149,848 $ 54,525
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 7,265 6,871 8,606
Stock-based compensation 4,635 4,747 4,599
Unrealized mark-to-market gain on derivative contracts (234) (326) 0
Bad debt expense (recovery), net (3) 278 (54)
Deferred income taxes (4,868) (7,474) (7,847)
Changes in operating assets and liabilities:      
Accounts receivable, net (2,435) (7,309) (99,718)
Contract assets and liabilities, net (23,495) (34,714) 227,598
Inventories 2,976 (21,818) (13,276)
Income taxes 1,178 2,515 4,812
Prepaid expenses and other current assets (1,677) (3,090) (3,253)
Accounts payable (7,491) 16,346 (6,167)
Accrued liabilities 9,733 5,011 11,729
Other, net 1,606 (2,224) 999
Net cash provided by operating activities 167,937 108,661 182,553
Investing Activities:      
Purchases of short-term investments (37,262) (42,855) (33,515)
Maturities of short-term investments 53,537 33,107 14,748
Cash paid for business acquisition, net of cash acquired (11,488) 0 0
Purchases of property, plant and equipment (13,149) (11,983) (7,819)
Proceeds from sale of property, plant and equipment 20 107 12
Purchase of intangible assets 0 (250) 0
Net cash used in investing activities (8,342) (21,874) (26,574)
Financing Activities:      
Shares withheld in lieu of employee tax withholding (12,248) (6,599) (652)
Dividends paid (12,869) (12,653) (12,407)
Net cash used in financing activities (25,117) (19,252) (13,059)
Net increase in cash and cash equivalents 134,478 67,535 142,920
Effect of exchange rate changes on cash and cash equivalents 930 1,921 1,001
Cash and cash equivalents at beginning of period 315,331 245,875 101,954
Cash and cash equivalents at end of period $ 450,739 $ 315,331 $ 245,875