Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Current assets:
Cash and cash equivalents	$ 47,738	$ 54,684
Marketable securities	62,320	51,524
Accounts receivable, net	24,136	26,433
Inventories	25,010	23,986
Deferred tax assets	2,571	2,610
Other	3,317	2,997
Total current assets	165,092	162,234
Marketable securities, long-term	5,567	1,603
Property, equipment and improvements, net	15,979	15,370
Identifiable intangible assets, net	12,278	14,360
Goodwill	86,114	86,012
Deferred tax assets	4,830	3,771
Other	508	545
Total assets	290,368	283,895
Current liabilities:
Accounts payable	11,981	6,492
Accrued compensation	5,295	7,758
Other	5,152	5,236
Total current liabilities	22,428	19,486
Income taxes payable	2,424	2,620
Deferred tax liabilities	710	813
Other noncurrent liabilities	120	260
Total liabilities	25,682	23,179
Contingencies (see Note 10)
Stockholders' equity:
Preferred stock, $.01 par value; 2,000,000 shares authorized;none issued and outstanding	0	0
Common stock, $.01 par value; 60,000,000 shares authorized; 29,167,990 and 29,100,577 shares issued	292	291
Additional paid-in capital	197,107	194,580
Retained earnings	105,514	102,668
Accumulated other comprehensive loss	(12,319)	(10,457)
Treasury stock, at cost, 3,411,653 and 3,471,930 shares	(25,908)	(26,366)
Total stockholders' equity	264,686	260,716
Total liabilities and stockholders' equity	$ 290,368	$ 283,895