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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Current assets:    
Cash and cash equivalents $ 45,657us-gaap_CashAndCashEquivalentsAtCarryingValue $ 47,490us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 39,220us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent 32,898us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Accounts receivable, net 28,615us-gaap_AccountsReceivableNetCurrent 28,576us-gaap_AccountsReceivableNetCurrent
Inventories 33,881us-gaap_InventoryNet 31,247us-gaap_InventoryNet
Deferred tax assets 3,388us-gaap_DeferredTaxAssetsNetCurrent 3,221us-gaap_DeferredTaxAssetsNetCurrent
Other 4,877us-gaap_PrepaidExpenseAndOtherAssetsCurrent 4,249us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 155,638us-gaap_AssetsCurrent 147,681us-gaap_AssetsCurrent
Marketable securities, long-term 7,550us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent 11,541us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
Property, equipment and improvements, net 14,617us-gaap_PropertyPlantAndEquipmentNet 13,231us-gaap_PropertyPlantAndEquipmentNet
Identifiable intangible assets, net 5,348us-gaap_FiniteLivedIntangibleAssetsNet 6,785us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill 101,742us-gaap_Goodwill 103,398us-gaap_Goodwill
Deferred tax assets 4,947us-gaap_DeferredTaxAssetsNetNoncurrent 7,383us-gaap_DeferredTaxAssetsNetNoncurrent
Other 320us-gaap_OtherAssetsNoncurrent 440us-gaap_OtherAssetsNoncurrent
Total assets 290,162us-gaap_Assets 290,459us-gaap_Assets
Current liabilities:    
Accounts payable 11,375us-gaap_AccountsPayableCurrent 10,451us-gaap_AccountsPayableCurrent
Accrued compensation 7,677us-gaap_EmployeeRelatedLiabilitiesCurrent 8,133us-gaap_EmployeeRelatedLiabilitiesCurrent
Other 3,421us-gaap_OtherLiabilitiesCurrent 3,170us-gaap_OtherLiabilitiesCurrent
Total current liabilities 22,473us-gaap_LiabilitiesCurrent 21,754us-gaap_LiabilitiesCurrent
Income taxes payable 1,893us-gaap_AccruedIncomeTaxesNoncurrent 2,724us-gaap_AccruedIncomeTaxesNoncurrent
Deferred tax liabilities 182us-gaap_DeferredTaxLiabilitiesNoncurrent 272us-gaap_DeferredTaxLiabilitiesNoncurrent
Other noncurrent liabilities 481us-gaap_OtherLiabilitiesNoncurrent 411us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 25,029us-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; 31,462,480 and 30,703,895 shares issued 315us-gaap_CommonStockValue 307us-gaap_CommonStockValue
Additional paid-in capital 224,873us-gaap_AdditionalPaidInCapitalCommonStock 218,689us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 118,923us-gaap_RetainedEarningsAccumulatedDeficit 117,816us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (24,009)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (18,277)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost, 6,538,789 and 6,313,937 shares (54,969)us-gaap_TreasuryStockValue (53,237)us-gaap_TreasuryStockValue
Total stockholders' equity 265,133us-gaap_StockholdersEquity 265,298us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 290,162us-gaap_LiabilitiesAndStockholdersEquity $ 290,459us-gaap_LiabilitiesAndStockholdersEquity