Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Current assets:
Cash and cash equivalents	$ 43,557	$ 41,320
Marketable securities	45,035	47,006
Accounts receivable, net	25,900	26,829
Inventories	30,592	26,140
Deferred tax assets	3,435	3,174
Other	5,261	4,835
Total current assets	153,780	149,304
Marketable securities, long-term	10,804	17,389
Property, equipment and improvements, net	13,673	13,910
Identifiable intangible assets, net	8,309	9,728
Goodwill	104,045	103,569
Deferred tax assets	6,520	5,832
Other	419	221
Total assets	297,550	299,953
Current liabilities:
Accounts payable	9,114	8,906
Accrued compensation	6,198	7,410
Accrued warranty	972	1,063
Other	2,725	3,911
Total current liabilities	19,009	21,290
Income taxes payable	2,387	3,903
Deferred tax liabilities	330	415
Other noncurrent liabilities	124	79
Total liabilities	21,850	25,687
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; 30,604,591 and 30,264,224 shares issued	306	303
Additional paid-in capital	216,657	211,982
Retained earnings	117,514	116,088
Accumulated other comprehensive loss	(15,389)	(15,590)
Treasury stock, at cost, 5,177,923 and 4,708,965 shares	(43,388)	(38,517)
Total stockholders' equity	275,700	274,266
Total liabilities and stockholders' equity	$ 297,550	$ 299,953