Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net income (loss)	$ 9,636	$ (4,063)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	4,312	4,831
Stock-based compensation	2,956	1,720
Bad debt expense, net	101	445
Deferred income taxes	(1,783)	(51)
Changes in operating assets and liabilities:
Accounts receivable, net	(63,300)	(12,662)
Contract assets and liabilities, net	123,082	9,888
Inventories	(8,060)	(13,835)
Income taxes	862	31
Prepaid expenses and other current assets	1,026	1,009
Accounts payable	(11,919)	3,372
Accrued liabilities	(3,331)	(5,761)
Other, net	1,932	2,068
Net cash provided by (used in) operating activities	55,514	(13,008)
Investing Activities:
Purchases of short-term investments	(3,695)	(15,090)
Maturities of short-term investments	7,385	7,995
Purchases of property, plant and equipment	(3,356)	(1,116)
Proceeds from sale of property, plant and equipment	12	587
Net cash provided by (used in) investing activities	346	(7,624)
Financing Activities:
Payments on industrial development revenue bonds	0	(400)
Shares withheld in lieu of employee tax withholding	(582)	(660)
Dividends paid	(6,180)	(6,106)
Net cash used in financing activities	(6,762)	(7,166)
Net increase (decrease) in cash and cash equivalents	49,098	(27,798)
Effect of exchange rate changes on cash and cash equivalents	987	(85)
Cash and cash equivalents at beginning of period	101,954	114,314
Cash and cash equivalents at end of period	$ 152,039	$ 86,431