Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Current Assets:
Cash and cash equivalents	$ 134,093	$ 160,216
Short-term investments	19,852	18,705
Accounts receivable, less allowance for credit losses of $382 and $510	72,070	69,957
Contract assets	42,728	50,995
Inventories	30,031	28,968
Income taxes receivable	147	467
Prepaid expenses	2,061	4,402
Other current assets	1,806	1,948
Total Current Assets	302,788	335,658
Property, plant and equipment, net	113,653	114,372
Operating lease assets, net	4,390	5,217
Goodwill and intangible assets, net	1,072	1,161
Deferred income taxes	4,666	3,644
Other assets	14,179	12,226
Total Assets	440,748	472,278
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	39,598	35,029
Contract liabilities	54,098	79,445
Accrued compensation and benefits	13,356	21,739
Accrued product warranty	2,467	2,771
Current operating lease liabilities	1,948	2,352
Income taxes payable	310	1,861
Other current liabilities	8,778	9,350
Total Current Liabilities	120,955	152,947
Long-term debt, net of current maturities	0	400
Deferred compensation	8,413	6,710
Long-term operating lease liabilities	2,897	3,434
Other long-term liabilities	2,151	2,161
Total Liabilities	134,416	165,652
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; 12,497,691 and 12,422,411 shares issued, respectively	125	124
Additional paid-in capital	63,112	61,998
Retained earnings	287,364	294,016
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(19,270)	(24,513)
Total Stockholders' Equity	306,332	306,626
Total Liabilities and Stockholders' Equity	$ 440,748	$ 472,278