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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Current assets:    
Cash and cash equivalents $ 45,892 $ 60,246
Marketable securities 44,806 58,372
Accounts receivable, net 24,969 24,634
Inventories 25,296 24,435
Deferred tax assets 3,151 3,389
Other 5,772 2,493
Total current assets 149,886 173,569
Marketable securities, long-term 13,108 2,016
Property, equipment and improvements, net 14,480 15,157
Identifiable intangible assets, net 11,021 10,629
Goodwill 102,611 86,209
Deferred tax assets 5,232 5,010
Other 528 494
Total assets 296,866 293,084
Current liabilities:    
Accounts payable 8,505 6,040
Income taxes payable 0 1,269
Accrued compensation 7,718 5,744
Accrued warranty 1,132 1,021
Other 3,424 4,118
Total current liabilities 20,779 18,192
Income taxes payable 3,284 3,294
Deferred tax liabilities 444 630
Other noncurrent liabilities 97 111
Total liabilities 24,604 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; 30,145,957 and 29,268,788 shares issued 301 293
Additional paid-in capital 210,248 199,495
Retained earnings 114,041 110,283
Accumulated other comprehensive loss (17,021) (13,725)
Treasury stock, at cost, 4,384,774 and 3,356,453 shares (35,307) (25,489)
Total stockholders' equity 272,262 270,857
Total liabilities and stockholders' equity $ 296,866 $ 293,084