Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Current Assets:
Cash and cash equivalents	$ 124,865	$ 90,040
Accounts receivable, less allowance for doubtful accounts of $924 and $1,399, respectively	111,494	125,771
Costs and estimated earnings in excess of billings on uncompleted contracts	73,806	86,734
Inventories	30,734	32,917
Income taxes receivable	3,611	485
Deferred income taxes	4,910	4,598
Prepaid expenses and other current assets	4,855	5,865
Total Current Assets	354,275	346,410
Property, plant and equipment, net	123,228	78,652
Goodwill	1,003	1,003
Intangible assets, net	11,996	13,317
Other assets	10,710	8,930
Total Assets	501,212	448,312
Current Liabilities:
Current maturities of long-term debt and capital lease obligations	439	725
Income taxes payable	4,676	3,516
Accounts payable	53,754	48,490
Accrued salaries, bonuses and commissions	23,461	25,822
Billings in excess of costs and estimated earnings on uncompleted contracts	67,187	37,144
Accrued product warranty	4,791	5,714
Other accrued expenses	6,333	9,462
Total Current Liabilities	160,641	130,873
Long-term debt and capital lease obligations, net of current maturities	3,200	3,630
Deferred compensation	3,324	2,891
Other liabilities	918	815
Total Liabilities	168,083	138,209
Commitments and Contingencies (Note H)
Stockholders' Equity:
Preferred stock, par value $.01; 5,000,000 shares authorized; none issued
Common stock, par value $.01; 30,000,000 shares authorized; 11,957,218 and 11,915,673 shares issued and outstanding, respectively	119	119
Additional paid-in capital	41,634	38,452
Retained earnings	295,427	271,911
Accumulated other comprehensive income (loss)	(4,051)	(379)
Total Stockholders' Equity	333,129	310,103
Total Liabilities and Stockholders' Equity	$ 501,212	$ 448,312