Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Sep. 30, 2010
Current Assets:
Cash and cash equivalents	$ 137,266	$ 115,353
Accounts receivable, less allowance for doubtful accounts of $759 and $907, respectively	106,809	91,766
Costs and estimated earnings in excess of billings on uncompleted contracts	42,664	38,064
Inventories, net	41,209	38,244
Income taxes receivable	5,191	6,726
Deferred income taxes	5,307	3,087
Prepaid expenses and other current assets	6,870	8,951
Total Current Assets	345,316	302,191
Property, plant and equipment, net	59,874	63,676
Goodwill	1,003	1,003
Intangible assets, net	24,469	26,132
Other assets	7,722	7,710
Total Assets	438,384	400,712
Current Liabilities:
Current maturities of long-term debt and capital lease obligations	1,378	1,683
Income taxes payable	3,408	1,500
Accounts payable	47,780	41,850
Accrued salaries, bonuses and commissions	16,220	25,064
Billings in excess of costs and estimated earnings on uncompleted contracts	64,565	31,009
Accrued product warranty	5,078	5,929
Other accrued expenses	6,729	7,711
Total Current Liabilities	145,158	114,746
Long-term debt and capital lease obligations, net of current maturities	4,387	5,202
Deferred compensation	3,279	2,730
Other liabilities	884	731
Total Liabilities	153,708	123,409
Commitments and Contingencies (Note J)
Stockholders' Equity:
Preferred stock, par value $.01; 5,000,000 shares authorized; none issued
Common stock, par value $.01; 30,000,000 shares authorized; 11,744,909 and 11,676,955 shares issued and outstanding, respectively	117	117
Additional paid-in capital	35,204	33,569
Retained earnings	249,206	244,969
Accumulated other comprehensive income (loss)	149	(1,352)
Total Stockholders' Equity	284,676	277,303
Total Liabilities and Equity	$ 438,384	$ 400,712