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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Cash flows from operating activities:    
Net income $ 13,786us-gaap_NetIncomeLoss $ 9,145us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 2,196us-gaap_ShareBasedCompensation 880us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation (119)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (171)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net periodic pension benefit cost 268us-gaap_PensionExpense 459us-gaap_PensionExpense
Depreciation and amortization 5,195us-gaap_DepreciationDepletionAndAmortization 4,490us-gaap_DepreciationDepletionAndAmortization
Deferred income taxes 4,850us-gaap_DeferredIncomeTaxExpenseBenefit 365us-gaap_DeferredIncomeTaxExpenseBenefit
Bad debt provision 325us-gaap_ProvisionForDoubtfulAccounts 112us-gaap_ProvisionForDoubtfulAccounts
Changes in operating assets and liabilities:    
Accounts and unbilled accounts receivable (10,727)us-gaap_IncreaseDecreaseInReceivables 9,482us-gaap_IncreaseDecreaseInReceivables
Inventories (6,745)us-gaap_IncreaseDecreaseInInventories (1,251)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses (3,887)us-gaap_IncreaseDecreaseInPrepaidExpense (307)us-gaap_IncreaseDecreaseInPrepaidExpense
Accounts payable 2,901us-gaap_IncreaseDecreaseInAccountsPayable (2,292)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued payroll and related costs (3,098)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (2,603)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Advance payments from customers 8,405us-gaap_IncreaseDecreaseInCustomerAdvances (2,651)us-gaap_IncreaseDecreaseInCustomerAdvances
Accrued warranty costs 918us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease 597us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease
Other assets and liabilities (1,323)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 7,557us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 12,945us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 23,812us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Purchases of property and equipment (4,474)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,554)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash flows from financing activities:    
Receipts under short-term borrowings 5,000us-gaap_ProceedsFromRepaymentsOfShortTermDebt  
Payments under short-term borrowings (26)us-gaap_RepaymentsOfShortTermDebt  
Excess tax benefits from stock-based compensation 119us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 171us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Cash dividends (4,561)us-gaap_PaymentsOfDividends (4,641)us-gaap_PaymentsOfDividends
Proceeds from exercise of stock options and employee stock purchase plan 969us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,230us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Payments to purchase and retire common stock (12,804)us-gaap_PaymentsForRepurchaseOfCommonStock (10,982)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (11,303)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (14,222)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate on changes in cash (2,220)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 119us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash and cash equivalents (5,052)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 5,155us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, at beginning of period 60,397us-gaap_CashAndCashEquivalentsAtCarryingValue 48,333us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, at end of period 55,345us-gaap_CashAndCashEquivalentsAtCarryingValue 53,488us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for -    
Interest 176us-gaap_InterestPaid 114us-gaap_InterestPaid
Income taxes 3,414us-gaap_IncomeTaxesPaidNet 3,567us-gaap_IncomeTaxesPaidNet
Non-cash financing activities:    
Dividends declared not yet paid $ 4,439us-gaap_DividendsPayableCurrentAndNoncurrent $ 4,504us-gaap_DividendsPayableCurrentAndNoncurrent