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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Current assets:    
Cash and cash equivalents $ 45,043us-gaap_CashAndCashEquivalentsAtCarryingValue $ 47,490us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 32,624us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent 32,898us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Accounts receivable, net 23,281us-gaap_AccountsReceivableNetCurrent 28,576us-gaap_AccountsReceivableNetCurrent
Inventories 33,364us-gaap_InventoryNet 31,247us-gaap_InventoryNet
Deferred tax assets 3,206us-gaap_DeferredTaxAssetsNetCurrent 3,221us-gaap_DeferredTaxAssetsNetCurrent
Other 5,372us-gaap_PrepaidExpenseAndOtherAssetsCurrent 4,249us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 142,890us-gaap_AssetsCurrent 147,681us-gaap_AssetsCurrent
Marketable securities, long-term 14,600us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent 11,541us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
Property, equipment and improvements, net 13,864us-gaap_PropertyPlantAndEquipmentNet 13,231us-gaap_PropertyPlantAndEquipmentNet
Identifiable intangible assets, net 6,061us-gaap_FiniteLivedIntangibleAssetsNet 6,785us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill 102,674us-gaap_Goodwill 103,398us-gaap_Goodwill
Deferred tax assets 6,766us-gaap_DeferredTaxAssetsNetNoncurrent 7,383us-gaap_DeferredTaxAssetsNetNoncurrent
Other 396us-gaap_OtherAssetsNoncurrent 440us-gaap_OtherAssetsNoncurrent
Total assets 287,251us-gaap_Assets 290,459us-gaap_Assets
Current liabilities:    
Accounts payable 12,032us-gaap_AccountsPayableCurrent 10,451us-gaap_AccountsPayableCurrent
Accrued compensation 7,517us-gaap_EmployeeRelatedLiabilitiesCurrent 8,133us-gaap_EmployeeRelatedLiabilitiesCurrent
Other 3,664us-gaap_OtherLiabilitiesCurrent 3,170us-gaap_OtherLiabilitiesCurrent
Total current liabilities 23,213us-gaap_LiabilitiesCurrent 21,754us-gaap_LiabilitiesCurrent
Income taxes payable 2,017us-gaap_AccruedIncomeTaxesNoncurrent 2,724us-gaap_AccruedIncomeTaxesNoncurrent
Deferred tax liabilities 37us-gaap_DeferredTaxLiabilitiesNoncurrent 272us-gaap_DeferredTaxLiabilitiesNoncurrent
Other noncurrent liabilities 600us-gaap_OtherLiabilitiesNoncurrent 411us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 25,867us-gaap_Liabilities 25,161us-gaap_Liabilities
Contingencies (see Note 9)      
Stockholders' equity:    
Preferred stock, $.01 par value; 2,000,000 shares authorized; none issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $.01 par value; 60,000,000 shares authorized; 30,704,895 and 30,703,895 shares issued 307us-gaap_CommonStockValue 307us-gaap_CommonStockValue
Additional paid-in capital 219,419us-gaap_AdditionalPaidInCapitalCommonStock 218,689us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 117,477us-gaap_RetainedEarningsAccumulatedDeficit 117,816us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (20,668)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (18,277)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost, 6,560,774 and 6,313,937 shares (55,151)us-gaap_TreasuryStockValue (53,237)us-gaap_TreasuryStockValue
Total stockholders' equity 261,384us-gaap_StockholdersEquity 265,298us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 287,251us-gaap_LiabilitiesAndStockholdersEquity $ 290,459us-gaap_LiabilitiesAndStockholdersEquity