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Stockholders' Equity (Details Textual) (USD $)
 12 Months Ended 0 Months Ended
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           50,000,000ango_CapitalStockSharesAuthorized
Shares of common stock 45,000,000us-gaap_CommonStockSharesAuthorized 45,000,000us-gaap_CommonStockSharesAuthorized       45,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare       $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized       5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare       $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Voting common stock, par value           $ 1ango_VotingCommonStockParOrStatedValuePerShareBeforeAmendment
Non-voting common stock, par value           $ 1ango_NonvotingCommonStockParOrStatedValuePerShareBeforeAmendment
Common stock, issued           9,200ango_NumberOfSharesIssuedInExchangeOfEachCommonShare
Common stock, shares outstanding           9,200,000ango_OutstandingSharesFullyPaidNonassessableCommonStock
Authorized the repurchase of common stock         20,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1  
Number of purchased shares 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 142,305us-gaap_TreasuryStockSharesAcquired      
Purchase of common stock for treasury     (2,104,000)us-gaap_TreasuryStockValueAcquiredCostMethod      
Stock-based compensation plans 2ango_NumberOfStockBasedCompensationPlans          
Maximum number of shares to be offered 5,800,000us-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 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 2,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue      
Unrecognized compensation cost for stock options 12.00%ango_AssumedAnnualStockOptionsForfeiturePercentage          
Average price of share issued $ 9.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased $ 9.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased $ 11.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased      
Stock based compensation pre tax amount 5,502,000us-gaap_AllocatedShareBasedCompensationExpense 4,609,000us-gaap_AllocatedShareBasedCompensationExpense 4,052,000us-gaap_AllocatedShareBasedCompensationExpense      
Stock based compensation after tax amount 3,640,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 3,069,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 2,605,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax      
Avista Capital Partners [Member]            
Other Ownership Interests [Line Items]            
Issuance of investment funds       9,500,000us-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 $ 1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= ango_PerformanceShareAndRestrictedStockUnitAwardsMember		 $ 1,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= ango_PerformanceShareAndRestrictedStockUnitAwardsMember		 $ 900,000us-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 1,497,674us-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 1,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ango_TwoThousandAndFourStockAndIncentiveAwardPlanMember		          
Options exercisable period 10 years          
Total number of common stock reserved for issuance 5,750,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ango_TwoThousandAndFourStockAndIncentiveAwardPlanMember		          
Incentive award plan to increase the minimum number of shares         200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_PlanNameAxis
= ango_TwoThousandAndFourStockAndIncentiveAwardPlanMember		  
Incentive award plan to increase the maximum number of shares         500,000ango_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 800,000us-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 1,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember		          
Total number of common stock available to be issued 423,895us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember		          
Share purchase periods 2ango_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 146,275us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember		 123,556us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember		 103,362us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember