Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities:
Net income	$ 57,573	$ 9,636
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,365	4,312
Stock-based compensation	2,863	2,956
Unrealized mark-to-market gain on derivative contracts	(30)	0
Bad debt expense, net	100	101
Deferred income taxes	(41)	(1,783)
Changes in operating assets and liabilities:
Accounts receivable, net	22,812	(63,300)
Contract assets and liabilities, net	21,338	123,082
Inventories	(18,137)	(8,060)
Income taxes	(1,555)	862
Prepaid expenses and other current assets	1,671	1,026
Accounts payable	22,879	(11,919)
Accrued liabilities	(11,453)	(3,331)
Other, net	(494)	1,932
Net cash provided by operating activities	100,891	55,514
Investing Activities:
Purchases of short-term investments	(12,551)	(3,695)
Maturities of short-term investments	3,691	7,385
Purchases of property, plant and equipment	(2,138)	(3,356)
Purchase of intangible assets	(250)	0
Proceeds from sale of property, plant and equipment	0	12
Net cash provided by (used in) investing activities	(11,248)	346
Financing Activities:
Shares withheld in lieu of employee tax withholding	(6,476)	(582)
Dividends paid	(6,299)	(6,180)
Net cash used in financing activities	(12,775)	(6,762)
Net increase in cash and cash equivalents	76,868	49,098
Effect of exchange rate changes on cash and cash equivalents	513	987
Cash and cash equivalents at beginning of period	245,875	101,954
Cash and cash equivalents at end of period	$ 323,256	$ 152,039