Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Current Assets:
Cash and cash equivalents	$ 323,256	$ 245,875
Short-term investments	42,083	33,134
Accounts receivable, less allowance for credit losses of $331 and $273, respectively	183,980	206,591
Contract assets	75,010	60,621
Inventories	82,075	63,865
Income taxes receivable	95	100
Prepaid expenses	3,362	5,419
Other current assets	6,784	6,380
Total Current Assets	716,645	621,985
Property, plant and equipment, net	96,655	97,625
Operating lease assets, net	1,089	1,436
Goodwill and intangible assets, net	1,503	1,003
Deferred income taxes	17,105	17,064
Other assets	16,621	13,129
Total Assets	849,618	752,242
Current Liabilities:
Accounts payable	79,767	56,666
Contract liabilities	315,699	279,796
Accrued compensation and benefits	19,624	29,947
Accrued product warranty	4,568	3,305
Current operating lease liabilities	573	773
Income taxes payable	4,954	6,517
Other current liabilities	16,641	18,682
Total Current Liabilities	441,826	395,686
Deferred compensation	11,195	9,145
Long-term operating lease liabilities	516	663
Other long-term liabilities	2,296	1,722
Total Liabilities	455,833	407,216
Commitments and Contingencies (Note F)
Stockholders' Equity:
Preferred stock, par value $0.01; 5,000,000 shares authorized; none issued	0	0
Common stock, par value $0.01; 30,000,000 shares authorized; 12,793,856 and 12,668,001 shares issued, respectively; 11,987,838 and 11,861,983 shares outstanding, respectively	128	127
Additional paid-in capital	68,348	71,526
Retained earnings	376,401	325,281
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(26,093)	(26,909)
Total Stockholders' Equity	393,785	345,026
Total Liabilities and Stockholders' Equity	$ 849,618	$ 752,242