Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Net income	$ 28,090	$ 4,998
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	6,500	7,206
Gain on sale of division	0	(2,006)
Stock-based compensation	3,914	2,308
Bad debt expense, net	36	274
Deferred income taxes	(2,551)	(5,548)
Changes in operating assets and liabilities:
Accounts receivable, net	(96,986)	(27,011)
Contract assets and liabilities, net	178,161	10,001
Inventories	(15,304)	(19,387)
Income taxes	(11)	(857)
Prepaid expenses and other current assets	(1,981)	18
Accounts payable	(249)	1,526
Accrued liabilities	3,528	(676)
Other, net	2,167	1,370
Net cash provided by (used in) operating activities	105,314	(27,784)
Investing Activities:
Purchases of short-term investments	(18,789)	(15,104)
Maturities of short-term investments	7,385	11,873
Proceeds from sale of division	0	4,348
Purchases of property, plant and equipment	(4,006)	(1,765)
Proceeds from sale of property, plant and equipment	12	629
Net cash used in investing activities	(15,398)	(19)
Financing Activities:
Payments on industrial development revenue bonds	0	(400)
Shares withheld in lieu of employee tax withholding	(582)	(663)
Dividends paid	(9,292)	(9,170)
Net cash used in financing activities	(9,874)	(10,233)
Net increase (decrease) in cash and cash equivalents	80,042	(38,036)
Effect of exchange rate changes on cash and cash equivalents	1,359	(448)
Cash and cash equivalents at beginning of period	101,954	114,314
Cash and cash equivalents at end of period	$ 183,355	$ 75,830