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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Sep. 30, 2013
Current assets:    
Cash and cash equivalents $ 55,917 $ 41,320
Marketable securities 32,329 47,006
Accounts receivable, net 24,654 26,829
Inventories 30,483 26,140
Deferred tax assets 3,464 3,174
Other 5,049 4,835
Total current assets 151,896 149,304
Marketable securities, long-term 12,338 17,389
Property, equipment and improvements, net 13,511 13,910
Identifiable intangible assets, net 7,557 9,728
Goodwill 104,329 103,569
Deferred tax assets 7,664 6,151
Other 437 221
Total assets 297,732 300,272
Current liabilities:    
Accounts payable 10,417 8,906
Accrued compensation 7,792 7,410
Accrued warranty 900 1,063
Other 2,349 3,911
Total current liabilities 21,458 21,290
Income taxes payable 2,392 3,903
Deferred tax liabilities 288 415
Other noncurrent liabilities 242 79
Total liabilities 24,380 25,687
Contingencies (see Note 11)      
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; 30,650,093 and 30,264,224 shares issued 306 303
Additional paid-in capital 217,720 211,982
Retained earnings 117,732 116,407
Accumulated other comprehensive loss (15,006) (15,590)
Treasury stock, at cost, 5,618,301 and 4,708,965 shares (47,400) (38,517)
Total stockholders' equity 273,352 274,585
Total liabilities and stockholders' equity $ 297,732 $ 300,272