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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Cash flows from operating activities:    
Net income $ 25,492us-gaap_NetIncomeLoss $ 16,924us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 3,922us-gaap_ShareBasedCompensation 2,469us-gaap_ShareBasedCompensation
Excess tax benefits for stock-based compensation (467)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (917)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net periodic pension benefit cost 511us-gaap_PensionExpense 620us-gaap_PensionExpense
Depreciation and amortization 10,354us-gaap_DepreciationDepletionAndAmortization 9,037us-gaap_DepreciationDepletionAndAmortization
Deferred income taxes 5,233us-gaap_DeferredIncomeTaxExpenseBenefit (527)us-gaap_DeferredIncomeTaxExpenseBenefit
Bad debt provision 639us-gaap_ProvisionForDoubtfulAccounts 453us-gaap_ProvisionForDoubtfulAccounts
Changes in operating assets and liabilities:    
Accounts and unbilled accounts receivable (9,407)us-gaap_IncreaseDecreaseInReceivables (5,178)us-gaap_IncreaseDecreaseInReceivables
Inventories (6,761)us-gaap_IncreaseDecreaseInInventories (1,123)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses (3,297)us-gaap_IncreaseDecreaseInPrepaidExpense (1,391)us-gaap_IncreaseDecreaseInPrepaidExpense
Accounts payable 10,283us-gaap_IncreaseDecreaseInAccountsPayable (1,312)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued payroll and related costs (5,852)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (2,035)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Advance payments from customers 1,478us-gaap_IncreaseDecreaseInCustomerAdvances 5,015us-gaap_IncreaseDecreaseInCustomerAdvances
Accrued warranty costs 1,087us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease 408us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease
Other assets and liabilities 2,407us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 1,680us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 35,622us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 24,123us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Purchases of property and equipment (9,132)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (10,494)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash flows from financing activities:    
Receipts under short-term borrowings 10,871us-gaap_ProceedsFromRepaymentsOfShortTermDebt 10,000us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Payments under short-term borrowings (26)us-gaap_RepaymentsOfShortTermDebt  
Excess tax benefits from stock-based compensation 467us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 917us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Cash dividends (9,079)us-gaap_PaymentsOfDividends (9,238)us-gaap_PaymentsOfDividends
Proceeds from exercise of stock options and employee stock purchase plan 3,370us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 3,477us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Payments to purchase and retire common stock (26,370)us-gaap_PaymentsForRepurchaseOfCommonStock (23,322)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (20,767)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (18,166)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate on changes in cash (4,861)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (76)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents 862us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (4,613)us-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 61,259us-gaap_CashAndCashEquivalentsAtCarryingValue 43,720us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for -    
Interest 451us-gaap_InterestPaid 202us-gaap_InterestPaid
Income taxes 8,319us-gaap_IncomeTaxesPaidNet 9,854us-gaap_IncomeTaxesPaidNet
Non-cash financing activities:    
Dividends declared not yet paid $ 4,407us-gaap_DividendsPayableCurrentAndNoncurrent $ 4,476us-gaap_DividendsPayableCurrentAndNoncurrent