Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Current assets:
Cash and cash equivalents	$ 42,568	$ 54,684
Marketable securities	54,130	51,524
Accounts receivable, net	23,920	26,433
Inventories	25,221	23,986
Deferred tax assets	2,595	2,610
Other	4,355	2,997
Total current assets	152,789	162,234
Marketable securities, long-term	9,511	1,603
Property, equipment and improvements, net	16,033	15,370
Identifiable intangible assets, net	13,199	14,360
Goodwill	85,607	86,012
Deferred tax assets	4,285	3,771
Other	519	545
Total assets	281,943	283,895
Current liabilities:
Accounts payable	7,224	6,492
Accrued compensation	5,173	7,758
Accrued warranty	1,007	941
Other	4,154	4,295
Total current liabilities	17,558	19,486
Income taxes payable	2,402	2,620
Deferred tax liabilities	741	813
Other noncurrent liabilities	184	260
Total liabilities	20,885	23,179
Contingencies (see Note 10)
Stockholders' equity:
Preferred stock, $.01 par value; 2,000,000 shares authorized;none issued and outstanding
Common stock, $.01 par value; 60,000,000 shares authorized; 29,115,604 and 29,100,577 shares issued	291	291
Additional paid-in capital	195,707	194,580
Retained earnings	103,392	102,668
Accumulated other comprehensive loss	(12,219)	(10,457)
Treasury stock, at cost, 3,438,598 and 3,471,930 shares	(26,113)	(26,366)
Total stockholders' equity	261,058	260,716
Total liabilities and stockholders' equity	$ 281,943	$ 283,895