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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Aug. 31, 2014
Current assets:    
Cash and cash equivalents $ 43,701us-gaap_CashAndCashEquivalentsAtCarryingValue $ 57,803us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 42,056us-gaap_ShortTermInvestments 45,050us-gaap_ShortTermInvestments
Trade and other accounts receivable, less allowance for doubtful accounts of $523 and $406 at February 28, 2015 and August 31, 2014 respectively 71,575us-gaap_AccountsReceivableNetCurrent 63,618us-gaap_AccountsReceivableNetCurrent
Inventories 34,677us-gaap_InventoryNet 34,989us-gaap_InventoryNet
Current deferred tax assets, net 5,712us-gaap_DeferredTaxAssetsNetCurrent 5,855us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 5,666us-gaap_OtherAssetsCurrent 8,339us-gaap_OtherAssetsCurrent
Total current assets 203,387us-gaap_AssetsCurrent 215,654us-gaap_AssetsCurrent
Property and equipment, net 10,215us-gaap_PropertyPlantAndEquipmentNet 9,702us-gaap_PropertyPlantAndEquipmentNet
Goodwill 96,444us-gaap_Goodwill 95,499us-gaap_Goodwill
Other intangible assets, net 24,511us-gaap_IntangibleAssetsNetExcludingGoodwill 23,671us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets 3,164us-gaap_OtherAssetsNoncurrent 3,154us-gaap_OtherAssetsNoncurrent
Total assets 337,721us-gaap_Assets 347,680us-gaap_Assets
Current liabilities:    
Accounts payable 23,049us-gaap_AccountsPayableCurrent 18,031us-gaap_AccountsPayableCurrent
Accrued liabilities 16,795us-gaap_AccruedLiabilitiesCurrent 18,382us-gaap_AccruedLiabilitiesCurrent
Revolving credit facility 103,000us-gaap_DebtCurrent 98,000us-gaap_DebtCurrent
Accrued payroll and related expenses 8,194us-gaap_EmployeeRelatedLiabilitiesCurrent 15,969us-gaap_EmployeeRelatedLiabilitiesCurrent
Income taxes payable 593us-gaap_AccruedIncomeTaxesCurrent 1,529us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities 151,631us-gaap_LiabilitiesCurrent 151,911us-gaap_LiabilitiesCurrent
Long-term deferred tax liabilities, net 23,283us-gaap_DeferredTaxLiabilitiesNoncurrent 24,253us-gaap_DeferredTaxLiabilitiesNoncurrent
Other long-term liabilities 2,255us-gaap_OtherLiabilitiesNoncurrent 2,101us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 177,169us-gaap_Liabilities 178,265us-gaap_Liabilities
Commitments and contingencies (Note 11)      
Shareholders' equity:    
Common stock ― authorized 36,000,000 shares, $0.001 par value; 19,508,893 and 19,464,310 shares issued at February 28, 2015 and August 31, 2014, respectively; and 14,598,538 and 14,754,362 shares outstanding at February 28, 2015 and August 31, 2014, respectively 20us-gaap_CommonStockValue 19us-gaap_CommonStockValue
Additional paid-in capital 138,632us-gaap_AdditionalPaidInCapitalCommonStock 136,212us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 249,109us-gaap_RetainedEarningsAccumulatedDeficit 237,596us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (loss) (7,143)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 1,103us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Common stock held in treasury, at cost ― 4,910,355 and 4,709,948 shares at February 28, 2015 and August 31, 2014, respectively (220,066)us-gaap_TreasuryStockValue (205,515)us-gaap_TreasuryStockValue
Total shareholders' equity 160,552us-gaap_StockholdersEquity 169,415us-gaap_StockholdersEquity
Total liabilities and shareholders' equity $ 337,721us-gaap_LiabilitiesAndStockholdersEquity $ 347,680us-gaap_LiabilitiesAndStockholdersEquity