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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:      
Net income $ 979us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 15,117us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 17,454us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net income to net cash provided by (used for) operating activities:      
Depreciation and amortization 4,565us-gaap_DepreciationDepletionAndAmortization 5,303us-gaap_DepreciationDepletionAndAmortization 5,114us-gaap_DepreciationDepletionAndAmortization
Provisions for contracts, inventory and accounts receivable reserves 674asei_ProvisionForDoubtfulAccountsAndContractsAndInventoryReserves 1,328asei_ProvisionForDoubtfulAccountsAndContractsAndInventoryReserves 5,405asei_ProvisionForDoubtfulAccountsAndContractsAndInventoryReserves
Amortization of bond premium 832us-gaap_AmortizationOfDebtDiscountPremium 1,551us-gaap_AmortizationOfDebtDiscountPremium 2,700us-gaap_AmortizationOfDebtDiscountPremium
Stock compensation expense 2,771us-gaap_ShareBasedCompensation 2,501us-gaap_ShareBasedCompensation 184us-gaap_ShareBasedCompensation
Other (49)us-gaap_OtherNoncashIncomeExpense   (59)us-gaap_OtherNoncashIncomeExpense
Deferred income taxes 2,655us-gaap_DeferredIncomeTaxExpenseBenefit 378us-gaap_DeferredIncomeTaxExpenseBenefit (2,966)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities:      
Accounts receivable 12,183us-gaap_IncreaseDecreaseInAccountsReceivable (5,813)us-gaap_IncreaseDecreaseInAccountsReceivable (3,382)us-gaap_IncreaseDecreaseInAccountsReceivable
Unbilled costs and fees 643us-gaap_IncreaseDecreaseInUnbilledReceivables 2,384us-gaap_IncreaseDecreaseInUnbilledReceivables (1,669)us-gaap_IncreaseDecreaseInUnbilledReceivables
Inventories (8,271)us-gaap_IncreaseDecreaseInInventories 13,761us-gaap_IncreaseDecreaseInInventories (4,933)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (5,237)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 3,636us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 813us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accrued income taxes (2,338)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 244us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 2,094us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Accounts payable (3,418)us-gaap_IncreaseDecreaseInAccountsPayable 2,247us-gaap_IncreaseDecreaseInAccountsPayable 910us-gaap_IncreaseDecreaseInAccountsPayable
Deferred revenue (6,501)us-gaap_IncreaseDecreaseInDeferredRevenue (6,430)us-gaap_IncreaseDecreaseInDeferredRevenue 1,661us-gaap_IncreaseDecreaseInDeferredRevenue
Customer deposits (2,633)us-gaap_IncreaseDecreaseInCustomerDeposits 390us-gaap_IncreaseDecreaseInCustomerDeposits 1,168us-gaap_IncreaseDecreaseInCustomerDeposits
Accrued expenses and other liabilities (7,991)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (4,051)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities 6,663us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Total adjustments (12,115)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 17,429us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 13,703us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash (used for) provided by operating activities (11,136)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 32,546us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 31,157us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Proceeds from sales and maturities of short-term investments 92,471us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 88,040us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 200,089us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Purchases of short-term investments (29,211)us-gaap_PaymentsToAcquireShortTermInvestments (69,668)us-gaap_PaymentsToAcquireShortTermInvestments (140,532)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from sale of fixed assets     110us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchases of property and equipment, net (2,580)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,821)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,618)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash provided by investing activities 60,680us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 16,551us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 56,049us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Decrease (increase) in restricted cash 8,515us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities (1,399)us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities 2,373us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities
Repurchase of shares of common stock (36,472)us-gaap_PaymentsForRepurchaseOfCommonStock (12,306)us-gaap_PaymentsForRepurchaseOfCommonStock (57,633)us-gaap_PaymentsForRepurchaseOfCommonStock
Payment of common stock dividend (15,607)us-gaap_PaymentsOfDividendsCommonStock (15,713)us-gaap_PaymentsOfDividendsCommonStock (16,841)us-gaap_PaymentsOfDividendsCommonStock
Repayment of leasehold financing liability (653)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (1,488)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (1,351)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from exercise of stock options 1,074us-gaap_ProceedsFromStockOptionsExercised 3,525us-gaap_ProceedsFromStockOptionsExercised 2,160us-gaap_ProceedsFromStockOptionsExercised
Reduction of income taxes paid due to the tax benefit from employee stock option expense 291us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 9us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 135us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash used for financing activities (42,852)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (27,372)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (71,157)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 6,692us-gaap_NetCashProvidedByUsedInContinuingOperations 21,725us-gaap_NetCashProvidedByUsedInContinuingOperations 16,049us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at beginning of year 62,143us-gaap_CashAndCashEquivalentsAtCarryingValue 40,418us-gaap_CashAndCashEquivalentsAtCarryingValue 24,369us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 68,835us-gaap_CashAndCashEquivalentsAtCarryingValue 62,143us-gaap_CashAndCashEquivalentsAtCarryingValue 40,418us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information:      
Write-off of asset and related leasehold financing liability (Note 2) 2,262us-gaap_SettlementOfAssetRetirementObligationsThroughNoncashPaymentsAmount    
Interest paid 18us-gaap_InterestPaid 53us-gaap_InterestPaid 73us-gaap_InterestPaid
Income taxes paid $ 5,102us-gaap_IncomeTaxesPaid $ 8,723us-gaap_IncomeTaxesPaid $ 7,367us-gaap_IncomeTaxesPaid