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Stockholders' Equity (Details Textual) (USD $) | 12 Months Ended | 0 Months Ended |
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May 31, 2014 OptionPlan | May 31, 2013 | May 31, 2012 | May 22, 2012 | Oct. 05, 2011 | Feb. 27, 2004
Other Ownership Interests [Line Items] |  |  |  |  |  |
Authorized capital stock |  |  |  |  |  | 50,000,000 ango_CapitalStockSharesAuthorized
Shares of common stock | 45,000,000 us-gaap_CommonStockSharesAuthorized | 45,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  | 45,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, par value | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Preferred stock, shares authorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare
Voting common stock, par value |  |  |  |  |  | $ 1 ango_VotingCommonStockParOrStatedValuePerShareBeforeAmendment
Non-voting common stock, par value |  |  |  |  |  | $ 1 ango_NonvotingCommonStockParOrStatedValuePerShareBeforeAmendment
Common stock, issued |  |  |  |  |  | 9,200 ango_NumberOfSharesIssuedInExchangeOfEachCommonShare
Common stock, shares outstanding |  |  |  |  |  | 9,200,000 ango_OutstandingSharesFullyPaidNonassessableCommonStock
Authorized the repurchase of common stock |  |  |  |  | 20,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Number of purchased shares | 0 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired | 142,305 us-gaap_TreasuryStockSharesAcquired |  |  |
Purchase of common stock for treasury |  |  | (2,104,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Stock-based compensation plans | 2 ango_NumberOfStockBasedCompensationPlans |  |  |  |  |
Maximum number of shares to be offered | 5,800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |  |  |  |
Percentage of grants to employees vesting | 25.00%ango_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardGrantedToEmployeesVestingPercentage |  |  |  |  |
Option grants to employees vesting period | 4 years |  |  |  |  |
Percentage of grants for consultants vesting | 100.00%ango_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardGrantedToConsultantsVestingPercentage |  |  |  |  |
Option grants to consultants vesting period | 1 year |  |  |  |  |
Percentage of Initial grants to directors vesting | 25.00%ango_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardInitialGrantsToDirectorsVestingPercentage |  |  |  |  |
Initial grants to directors vesting period | 4 years |  |  |  |  |
Subsequent grants for directors vesting | 33.33%ango_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardSubsequentGrantsToDirectorsVestingPercentage |  |  |  |  |
Subsequent grants for directors vesting period | 3 years |  |  |  |  |
The total intrinsic value of options exercised | 1,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 2,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |
Unrecognized compensation cost for stock options | 12.00%ango_AssumedAnnualStockOptionsForfeiturePercentage |  |  |  |  |
Average price of share issued | $ 9.30 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased | $ 9.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased | $ 11.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased |  |  |
Stock based compensation pre tax amount | 5,502,000 us-gaap_AllocatedShareBasedCompensationExpense | 4,609,000 us-gaap_AllocatedShareBasedCompensationExpense | 4,052,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |
Stock based compensation after tax amount | 3,640,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 3,069,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 2,605,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax |  |  |
Avista Capital Partners [Member] |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |
Issuance of investment funds |  |  |  | 9,500,000 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_LimitedPartnersCapitalAccountByClassAxis = ango_AvistaCapitalPartnersMember |  |
Common stock, outstanding shares, percentage | 27.00%ango_BusinessAcquisitionPercentageOfEquityInterestsIssued / us-gaap_LimitedPartnersCapitalAccountByClassAxis = ango_AvistaCapitalPartnersMember |  |  |  |  |
Performance Share and Restricted Stock Unit Awards [Member] |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |
Total fair value of restricted stock awards vesting | $ 1,800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ango_PerformanceShareAndRestrictedStockUnitAwardsMember | $ 1,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ango_PerformanceShareAndRestrictedStockUnitAwardsMember | $ 900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ango_PerformanceShareAndRestrictedStockUnitAwardsMember |  |  |
1997 Stock Option Plan [Member] |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |
Total number of common stock available to be issued | 1,497,674 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ango_OneThousandNineHundredNinetySevenStockOptionPlanMember |  |  |  |  |
Options exercisable period | 10 years |  |  |  |  |
2004 Stock and Incentive Award Plan [Member] |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |
Total number of common stock available to be issued | 1,600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ango_TwoThousandAndFourStockAndIncentiveAwardPlanMember |  |  |  |  |
Options exercisable period | 10 years |  |  |  |  |
Total number of common stock reserved for issuance | 5,750,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = ango_TwoThousandAndFourStockAndIncentiveAwardPlanMember |  |  |  |  |
Incentive award plan to increase the minimum number of shares |  |  |  |  | 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee / us-gaap_PlanNameAxis = ango_TwoThousandAndFourStockAndIncentiveAwardPlanMember |
Incentive award plan to increase the maximum number of shares |  |  |  |  | 500,000 ango_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmendedMaximumNumberOfSharesPerEmployee / us-gaap_PlanNameAxis = ango_TwoThousandAndFourStockAndIncentiveAwardPlanMember |
2004 Stock and Incentive Award Plan [Member] | Maximum [Member] |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |
Total number of common stock available to be issued | 800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ango_TwoThousandAndFourStockAndIncentiveAwardPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |
Maximum number of shares to be offered | 1,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Total number of common stock available to be issued | 423,895 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Share purchase periods | 2 ango_NumberOfSharePurchasePeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Duration of purchase of shares | 6 months |  |  |  |  |
Employee eligible in participating in offering period | 6 months |  |  |  |  |
Working schedule of employee to participate in offering period | 20 or more hours per week and more than five months in a calendar year |  |  |  |  |
Employees ownership threshold | 5.00%ango_EmployeePlanParticipatingEligibilityThresholdPercentage / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Percentage of fair market value of a share of common stock on the first day of the offering period | 85.00%ango_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercentOnFirstDayOfOfferingPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Percentage of fair market value of a share of common stock on the last day of the offering period | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Maximum number of shares to be offered under the Stock Purchase Plan | 146,275 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember | 123,556 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember | 103,362 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |

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