Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 42,357	$ 60,246
Marketable securities	37,401	58,372
Accounts receivable, net	23,857	24,634
Inventories	25,799	24,435
Deferred tax assets	3,472	3,389
Other	5,925	2,493
Total current assets	138,811	173,569
Marketable securities, long-term	22,105	2,016
Property, equipment and improvements, net	15,107	15,157
Identifiable intangible assets, net	11,938	10,629
Goodwill	102,473	86,209
Deferred tax assets	4,636	5,010
Other	526	494
Total assets	295,596	293,084
Current liabilities:
Accounts payable	7,387	6,040
Income taxes payable	0	1,269
Accrued compensation	5,789	5,744
Accrued warranty	925	1,021
Accrued legal settlement	1,525	0
Other	3,562	4,118
Total current liabilities	19,188	18,192
Income taxes payable	3,363	3,294
Deferred tax liabilities	489	630
Other noncurrent liabilities	100	111
Total liabilities	23,140	22,227
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; 30,070,229 and 29,268,788 shares issued	301	293
Additional paid-in capital	208,795	199,495
Retained earnings	112,513	110,283
Accumulated other comprehensive loss	(17,140)	(13,725)
Treasury stock, at cost, 4,033,176 and 3,356,453 shares	(32,013)	(25,489)
Total stockholders' equity	272,456	270,857
Total liabilities and stockholders' equity	$ 295,596	$ 293,084