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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Cash flows from operating activities:      
Net income (loss) $ 2,666us-gaap_NetIncomeLoss $ (1,211)us-gaap_NetIncomeLoss $ (5,183)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 28,157us-gaap_DepreciationAndAmortization 27,227us-gaap_DepreciationAndAmortization 14,676us-gaap_DepreciationAndAmortization
Amortization of bond discount 0us-gaap_AmortizationOfDebtDiscountPremium 0us-gaap_AmortizationOfDebtDiscountPremium 707us-gaap_AmortizationOfDebtDiscountPremium
Amortization of acquired inventory basis step-up 150ango_AmortizationOfAcquiredInventoryBasisStepUp 3,845ango_AmortizationOfAcquiredInventoryBasisStepUp 431ango_AmortizationOfAcquiredInventoryBasisStepUp
Tax effect of exercise of stock options and issuance of performance shares (146)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (1,644)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (309)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Deferred income tax provision 2,951ango_DeferredIncomeTaxRelatedToOperatingActivity 666ango_DeferredIncomeTaxRelatedToOperatingActivity (703)ango_DeferredIncomeTaxRelatedToOperatingActivity
Stock based compensation 5,502us-gaap_ShareBasedCompensation 4,609us-gaap_ShareBasedCompensation 4,052us-gaap_ShareBasedCompensation
Changes in accounts receivable allowances 465us-gaap_ProvisionForDoubtfulAccounts 338us-gaap_ProvisionForDoubtfulAccounts 118us-gaap_ProvisionForDoubtfulAccounts
Gain on sales of assets 0us-gaap_GainLossOnDispositionOfAssets (711)us-gaap_GainLossOnDispositionOfAssets 0us-gaap_GainLossOnDispositionOfAssets
Change in fair value of contingent consideration (1,808)ango_ChangeInFairValueOfContingentConsideration 1,583ango_ChangeInFairValueOfContingentConsideration 0ango_ChangeInFairValueOfContingentConsideration
Loss on discontinuance of product offering 0ango_LossOnDiscontinuanceOfProductOffering 1,416ango_LossOnDiscontinuanceOfProductOffering 0ango_LossOnDiscontinuanceOfProductOffering
Other (17)us-gaap_OtherNoncashIncomeExpense 157us-gaap_OtherNoncashIncomeExpense 1,148us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable (14,786)us-gaap_IncreaseDecreaseInAccountsReceivable 1,020us-gaap_IncreaseDecreaseInAccountsReceivable (2,395)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (5,608)us-gaap_IncreaseDecreaseInInventories (1,909)us-gaap_IncreaseDecreaseInInventories (1,522)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other 497us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 977us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (6,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued liabilities 6,658us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (9,711)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 6,582us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash provided by operating activities 24,681us-gaap_NetCashProvidedByUsedInOperatingActivities 26,652us-gaap_NetCashProvidedByUsedInOperatingActivities 11,602us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Additions to property, plant and equipment (11,172)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (12,120)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,492)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition of businesses, net of cash acquired (4,169)us-gaap_PaymentsToAcquireBusinessTwoNetOfCashAcquired (24,474)us-gaap_PaymentsToAcquireBusinessTwoNetOfCashAcquired (237,191)us-gaap_PaymentsToAcquireBusinessTwoNetOfCashAcquired
Acquisition of intangible assets, net of cash acquired (1,435)ango_PaymentsToAcquireIntangibleAssetsNetOfCashAcquired (800)ango_PaymentsToAcquireIntangibleAssetsNetOfCashAcquired (550)ango_PaymentsToAcquireIntangibleAssetsNetOfCashAcquired
Other cash flows from investing activities 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 801us-gaap_PaymentsForProceedsFromOtherInvestingActivities (4,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Change in escrow receivable 0us-gaap_IncreaseDecreaseInDepositOtherAssets 2,500us-gaap_IncreaseDecreaseInDepositOtherAssets (2,500)us-gaap_IncreaseDecreaseInDepositOtherAssets
Purchases of marketable securities (25)us-gaap_PaymentsToAcquireMarketableSecurities (5,134)us-gaap_PaymentsToAcquireMarketableSecurities (123,614)us-gaap_PaymentsToAcquireMarketableSecurities
Proceeds from sale or maturity of marketable securities 353us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 16,989us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 194,113us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Net cash used in investing activities (16,448)us-gaap_NetCashProvidedByUsedInInvestingActivities (22,238)us-gaap_NetCashProvidedByUsedInInvestingActivities (176,234)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Repayment of long-term debt (146,250)us-gaap_RepaymentsOfLongTermDebt (7,500)us-gaap_RepaymentsOfLongTermDebt (6,550)us-gaap_RepaymentsOfLongTermDebt
Proceeds from borrowings on revolving credit facility 46,410us-gaap_ProceedsFromLongTermLinesOfCredit 0us-gaap_ProceedsFromLongTermLinesOfCredit 0us-gaap_ProceedsFromLongTermLinesOfCredit
Proceeds from issuance of long-term debt 100,000us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 150,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Proceeds from exercise of stock options and ESPP 2,444us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,214us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 3,356us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Payment of contingent consideration previously established in purchase accounting (15,943)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Deferred financing costs on long-term debt (677)us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts (2,378)us-gaap_PaymentsOfDebtIssuanceCosts
Repurchase of common stock for treasury 0us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock (2,104)us-gaap_PaymentsForRepurchaseOfCommonStock
Tax effect of the exercise of stock options and issuance of performance shares 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 14us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash (used in) provided by financing activities (14,016)us-gaap_NetCashProvidedByUsedInFinancingActivities (6,286)us-gaap_NetCashProvidedByUsedInFinancingActivities 142,338us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents 86us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (65)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 49us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Decrease in cash and cash equivalents (5,697)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,937)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (22,245)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents      
Beginning of year 21,802us-gaap_CashAndCashEquivalentsAtCarryingValue 23,739us-gaap_CashAndCashEquivalentsAtCarryingValue 45,984us-gaap_CashAndCashEquivalentsAtCarryingValue
End of year 16,105us-gaap_CashAndCashEquivalentsAtCarryingValue 21,802us-gaap_CashAndCashEquivalentsAtCarryingValue 23,739us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of non-cash operating, investing and financing activities:      
Contractual obligations for acquisition of fixed assets 4,970us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1 1,549us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1 217us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1
Contractual obligations for acquisition of intangibles and business 2,249ango_NoncashOrPartNoncashAcquisitionIntangibleAssetsAndBusinessAcquired 78,286ango_NoncashOrPartNoncashAcquisitionIntangibleAssetsAndBusinessAcquired 117,926ango_NoncashOrPartNoncashAcquisitionIntangibleAssetsAndBusinessAcquired
Cash paid during the period for:      
Interest 3,591us-gaap_InterestPaid 4,936us-gaap_InterestPaid 438us-gaap_InterestPaid
Income taxes $ 182us-gaap_IncomeTaxesPaid $ 200us-gaap_IncomeTaxesPaid $ 2,832us-gaap_IncomeTaxesPaid