Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Current Assets:
Cash and cash equivalents	$ 120,571	$ 118,639
Short-term investments	0	6,042
Accounts receivable, less allowance for doubtful accounts of $300 and $301	90,495	112,093
Contract assets	61,336	55,374
Inventories	31,136	29,202
Income taxes receivable	105	233
Prepaid expenses	2,315	4,335
Other current assets	1,774	2,650
Total Current Assets	307,732	328,568
Property, plant and equipment, net	115,192	120,812
Operating lease assets, net	5,606
Goodwill and intangible assets, net	1,249	1,337
Deferred income taxes	4,411	5,117
Other assets	12,407	11,577
Total Assets	446,597	467,411
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	44,106	51,180
Contract liabilities	57,821	71,464
Accrued compensation and benefits	15,402	20,182
Accrued product warranty	3,276	2,946
Current operating lease liabilities	2,062
Income taxes payable	912	913
Other current liabilities	9,017	10,811
Total Current Liabilities	132,996	157,896
Long-term debt, net of current maturities	400	800
Deferred compensation	5,653	6,447
Long-term operating lease liabilities	4,229
Other long-term liabilities	3,188	3,115
Total Liabilities	146,466	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; 12,420,031 and 12,372,766 shares issued, respectively	124	124
Additional paid-in capital	60,492	59,153
Retained earnings	293,590	289,422
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(29,076)	(24,547)
Total Stockholders' Equity	300,131	299,153
Total Liabilities and Stockholders' Equity	$ 446,597	$ 467,411