Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Current Assets:
Cash and cash equivalents	$ 120,966	$ 118,639
Short-term investments	0	6,042
Accounts receivable, less allowance for doubtful accounts of $346 and $301	100,890	112,093
Contract assets	60,296	55,374
Inventories	32,448	29,202
Income taxes receivable	149	233
Prepaid expenses	4,646	4,335
Other current assets	1,906	2,650
Total Current Assets	321,301	328,568
Property, plant and equipment, net	120,795	120,812
Operating lease assets, net	6,213
Goodwill and intangible assets, net	1,293	1,337
Deferred income taxes	5,243	5,117
Other assets	11,606	11,577
Total Assets	466,451	467,411
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	45,166	51,180
Contract liabilities	77,556	71,464
Accrued compensation and benefits	9,763	20,182
Accrued product warranty	3,162	2,946
Current operating lease liabilities	2,247
Income taxes payable	1,034	913
Other current liabilities	10,215	10,811
Total Current Liabilities	149,543	157,896
Long-term debt, net of current maturities	400	800
Deferred compensation	7,052	6,447
Long-term operating lease liabilities	4,792
Other long-term liabilities	2,991	3,115
Total Liabilities	164,778	168,258
Commitments and Contingencies (Note F)
Stockholders' Equity:
Preferred stock, par value $.01; 5,000,000 shares authorized; none issued	0	0
Common stock, par value $.01; 30,000,000 shares authorized; 12,403,231 and 12,372,766 shares issued, respectively	124	124
Additional paid-in capital	59,524	59,153
Retained earnings	289,184	289,422
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(22,160)	(24,547)
Total Stockholders' Equity	301,673	299,153
Total Liabilities and Stockholders' Equity	$ 466,451	$ 467,411