Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Current assets:
Cash and cash equivalents	$ 50,470	$ 41,320
Marketable securities	47,341	47,006
Accounts receivable, net	23,788	26,829
Inventories	30,479	26,140
Deferred tax assets	3,499	3,174
Other	5,150	4,835
Total current assets	160,727	149,304
Marketable securities, long-term	9,983	17,389
Property, equipment and improvements, net	13,866	13,910
Identifiable intangible assets, net	9,050	9,728
Goodwill	103,918	103,569
Deferred tax assets	5,954	5,832
Other	244	221
Total assets	303,742	299,953
Current liabilities:
Accounts payable	10,040	8,906
Accrued compensation	6,493	7,410
Accrued warranty	1,013	1,063
Other	3,153	3,911
Total current liabilities	20,699	21,290
Income taxes payable	3,625	3,903
Deferred tax liabilities	376	415
Other noncurrent liabilities	114	79
Total liabilities	24,814	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; 30,565,685 and 30,264,224 shares issued	306	303
Additional paid-in capital	215,296	211,982
Retained earnings	116,776	116,088
Accumulated other comprehensive loss	(15,224)	(15,590)
Treasury stock, at cost, 4,673,917 and 4,708,965 shares	(38,226)	(38,517)
Total stockholders' equity	278,928	274,266
Total liabilities and stockholders' equity	$ 303,742	$ 299,953