Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Current Assets:
Cash and cash equivalents	$ 156,026	$ 118,639
Short-term investments	7,330	6,042
Accounts receivable, less allowance for doubtful accounts of $434 and $301	97,144	112,093
Contract assets	51,723	55,374
Inventories	31,663	29,202
Income taxes receivable	373	233
Prepaid expenses	4,009	4,335
Other current assets	1,883	2,650
Total Current Assets	350,151	328,568
Property, plant and equipment, net	114,826	120,812
Operating lease assets, net	5,542
Goodwill and intangible assets, net	1,205	1,337
Deferred income taxes	3,477	5,117
Other assets	11,997	11,577
Total Assets	487,198	467,411
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	38,512	51,180
Contract liabilities	97,969	71,464
Accrued compensation and benefits	18,618	20,182
Accrued product warranty	3,011	2,946
Current operating lease liabilities	2,306
Income taxes payable	425	913
Other current liabilities	9,258	10,811
Total Current Liabilities	170,499	157,896
Long-term debt, net of current maturities	400	800
Deferred compensation	6,524	6,447
Long-term operating lease liabilities	3,870
Other long-term liabilities	2,334	3,115
Total Liabilities	183,627	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; 12,420,631 and 12,372,766 shares issued, respectively	124	124
Additional paid-in capital	60,927	59,153
Retained earnings	294,052	289,422
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(26,533)	(24,547)
Total Stockholders' Equity	303,571	299,153
Total Liabilities and Stockholders' Equity	$ 487,198	$ 467,411