Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Current Assets:
Cash and cash equivalents	$ 104,270	$ 123,466
Cash held in escrow	0	1,000
Accounts receivable, less allowance for doubtful accounts of $588 and $391, respectively	130,887	109,317
Costs and estimated earnings in excess of billings on uncompleted contracts	53,138	51,568
Inventories, net	37,735	36,640
Income taxes receivable	2,378	4,071
Deferred income taxes	3,781	3,580
Prepaid expenses and other current assets	4,331	7,040
Total Current Assets	336,520	336,682
Property, plant and equipment, net	66,508	59,637
Goodwill	1,003	1,003
Intangible assets, net	15,156	15,847
Other assets	7,789	8,507
Total Assets	426,976	421,676
Current Liabilities:
Current maturities of long-term debt and capital lease obligations	1,038	1,140
Income taxes payable	450	881
Accounts payable	51,604	56,893
Accrued salaries, bonuses and commissions	15,388	22,314
Billings in excess of costs and estimated earnings on uncompleted contracts	65,142	44,523
Accrued product warranty	4,396	4,603
Other accrued expenses	7,951	7,370
Total Current Liabilities	145,969	137,724
Long-term debt and capital lease obligations, net of current maturities	3,803	4,301
Deferred compensation	2,670	3,242
Other liabilities	1,069	1,066
Total Liabilities	153,511	146,333
Commitments and Contingencies (Note I)
Stockholders' Equity:
Preferred stock, par value $.01; 5,000,000 shares authorized; none issued
Common stock, par value $.01; 30,000,000 shares authorized; 11,766,981 and 11,752,393 shares issued and outstanding, respectively	118	117
Additional paid-in capital	34,415	34,343
Retained earnings	240,510	242,254
Accumulated other comprehensive income (loss)	(1,578)	(1,371)
Total Stockholders' Equity	273,465	275,343
Total Liabilities and Stockholders' Equity	$ 426,976	$ 421,676