Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Current Assets:
Cash and cash equivalents	$ 114,062	$ 90,040
Accounts receivable, less allowance for doubtful accounts of $912 and $1,399, respectively	112,354	125,771
Costs and estimated earnings in excess of billings on uncompleted contracts	72,077	86,734
Inventories	32,246	32,917
Income taxes receivable	1,712	485
Deferred income taxes	4,798	4,598
Prepaid expenses and other current assets	6,334	5,865
Total Current Assets	343,583	346,410
Property, plant and equipment, net	105,863	78,652
Goodwill	1,003	1,003
Intangible assets, net	12,439	13,317
Other assets	10,537	8,930
Total assets	473,425	448,312
Current Liabilities:
Current maturities of long-term debt and capital lease obligations	463	725
Income taxes payable	988	3,516
Accounts payable	51,085	48,490
Accrued salaries, bonuses and commissions	19,304	25,822
Billings in excess of costs and estimated earnings on uncompleted contracts	58,202	37,144
Accrued product warranty	5,242	5,714
Other accrued expenses	5,998	9,462
Total Current Liabilities	141,282	130,873
Long-term debt and capital lease obligations, net of current maturities	3,200	3,630
Deferred compensation	3,364	2,891
Other liabilities	921	815
Total Liabilities	148,767	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; 11,953,301 and 11,915,673 shares issued and outstanding, respectively	119	119
Additional paid-in capital	40,675	38,452
Retained earnings	286,114	271,911
Accumulated other comprehensive income (loss)	(2,250)	(379)
Total Stockholders' Equity	324,658	310,103
Total Liabilities and Stockholders' Equity	$ 473,425	$ 448,312