Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Current Assets:
Cash and cash equivalents	$ 32,484	$ 97,720
Short-term investments	55,364	0
Restricted cash	15,485	0
Accounts receivable, less allowance for doubtful accounts of $90 and $811	77,547	101,048
Costs and estimated earnings in excess of billings on uncompleted contracts	46,127	66,106
Inventories	19,028	26,521
Income taxes receivable	7,544	1,713
Deferred income taxes	4,061	4,006
Prepaid expenses	2,293	4,569
Other current assets	386	2,457
Total Current Assets	260,319	304,140
Property, plant and equipment, net	138,664	144,977
Restricted cash	9,816	0
Goodwill and intangible assets, net	1,822	2,059
Other assets	13,708	11,340
Total Assets	424,329	462,516
Current Liabilities:
Current maturities of long-term debt	400	400
Accounts payable	25,218	34,985
Accrued salaries, bonuses and commissions	14,106	22,550
Billings in excess of costs and estimated earnings on uncompleted contracts	41,882	43,974
Accrued product warranty	3,332	4,639
Income taxes payable	1,084	1,459
Other accrued expenses	4,000	8,212
Deferred credit ─ short term (Note D)	1,015	2,029
Total Current Liabilities	91,037	118,248
Long-term debt, net of current maturities	1,600	2,000
Deferred compensation	5,073	4,840
Deferred income taxes	0	138
Other long-term liabilities	1,519	1,466
Deferred credit ─ long term (Note D)	0	507
Total Liabilities	99,229	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	53,909	52,003
Retained earnings	318,712	331,959
Treasury stock, 806,018 shares at cost	(24,999)	(24,999)
Accumulated other comprehensive loss	(22,644)	(23,768)
Total Stockholders' Equity	325,100	335,317
Total Liabilities and Stockholders' Equity	$ 424,329	$ 462,516