Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Current Assets:
Cash and cash equivalents	$ 93,468	$ 97,720
Short-term investments	14,874	0
Accounts receivable, less allowance for doubtful accounts of $310 and $811	66,753	101,048
Costs and estimated earnings in excess of billings on uncompleted contracts	56,618	66,106
Inventories	20,362	26,521
Income taxes receivable	4,196	1,713
Deferred income taxes	4,173	4,006
Prepaid expenses	2,723	4,569
Other current assets	2,834	2,457
Total Current Assets	266,001	304,140
Property, plant and equipment, net	139,417	144,977
Goodwill and intangible assets, net	1,887	2,059
Other assets	12,654	11,340
Total Assets	419,959	462,516
Current Liabilities:
Current maturities of long-term debt	400	400
Income taxes payable	922	1,459
Accounts payable	27,672	34,985
Accrued salaries, bonuses and commissions	12,783	22,550
Billings in excess of costs and estimated earnings on uncompleted contracts	32,539	43,974
Accrued product warranty	3,649	4,639
Other accrued expenses	4,425	8,212
Deferred credit ─ short term (Note D)	1,522	2,029
Total Current Liabilities	83,912	118,248
Long-term debt, net of current maturities	1,600	2,000
Deferred compensation	4,923	4,840
Deferred income taxes	62	138
Other long-term liabilities	1,510	1,466
Deferred credit ─ long term (Note D)	0	507
Total Liabilities	92,007	127,199
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; 12,234,656 and 12,199,511 shares issued, respectively	122	122
Additional paid-in capital	53,425	52,003
Retained earnings	324,897	331,959
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(25,493)	(23,768)
Total Stockholders' Equity	327,952	335,317
Total Liabilities and Stockholders' Equity	$ 419,959	$ 462,516