Accounts receivable due period.

No definition available.

Name:	ango_AccountsReceivableDuePeriod
Namespace Prefix:	ango_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Costs for quality call to action program.

+ References

No definition available.

+ Details

Name:	ango_CostsForQualityCallToActionProgram
Namespace Prefix:	ango_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of excise tax imposed on the sale of certain medical devices.

+ References

No definition available.

+ Details

Name:	ango_MedicalDeviceExciseTax
Namespace Prefix:	ango_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of business days to provide response.

+ References

No definition available.

+ Details

Name:	ango_NumberOfBusinessDaysToProvideResponse
Namespace Prefix:	ango_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of investments failed at auction.

+ References

No definition available.

+ Details

Name:	ango_NumberOfInvestmentsFailedAtAuction
Namespace Prefix:	ango_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of months remaining for product to be accepted prior to expiration date of product

+ References

No definition available.

+ Details

Name:	ango_NumberOfMonthsRemainingForProductToBeAcceptedPriorToExpirationDateOfProduct
Namespace Prefix:	ango_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of observations.

+ References

No definition available.

+ Details

Name:	ango_NumberOfObservations
Namespace Prefix:	ango_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of restocking charge.

+ References

No definition available.

+ Details

Name:	ango_PercentageOfRestockingCharge
Namespace Prefix:	ango_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Short term investments maturity period.

+ References

No definition available.

+ Details

Name:	ango_ShortTermInvestmentsMaturityPeriod
Namespace Prefix:	ango_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The value of securities held, for which the interest rate resets through an auction process, that are categorized neither as trading nor held-to-maturity, that failed to be liquidated through auction.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableforsaleSecuritiesFailedAuctionValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsLiabilitiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

No definition available.

+ Details

Name:	us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2611-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

Name:	us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4542-108314

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 1C
-URI http://asc.fasb.org/extlink&oid=68049868&loc=SL66093883-108312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=68049868&loc=SL66093879-108312

+ Details

Name:	us-gaap_InventoryWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=ango_DistributionRightsandCustomerListsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=ango_FormerPresidentandChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details Textual) $ in Thousands						1 Months Ended				3 Months Ended	9 Months Ended	12 Months Ended			41 Months Ended
	Mar. 31, 2016	Mar. 31, 2014 Observation	Feb. 04, 2014 Observation	Feb. 13, 2012 Observation	Feb. 10, 2012 Observation	Apr. 21, 2014	Feb. 25, 2014	Sep. 24, 2012 Observation	Mar. 05, 2012	May 31, 2016 USD ($) Investment	Feb. 28, 2014	May 31, 2016 USD ($) Investment	May 31, 2015 USD ($)	May 31, 2014 USD ($)	May 31, 2016 USD ($) Investment	Nov. 30, 2015 USD ($)
Business Acquisition [Line Items]
Medical device excise tax												$ 2,416	$ 4,142	$ 3,829	$ 12,000
Inventory write-off												5,800
Write-off of hardware assets												$ 100
Costs for quality call to action program													3,200
Number of observations \| Observation		3	1	6	12			5
Number of business days to provide response to FDA						15 days	15 days		15 days		15 days
Short Term Investments Maturity Period												less than three months
Investments in auction rate securities that failed auctions										$ 1,700		$ 1,700			$ 1,700
Number of investments \| Investment										2		2			2
Restocking charge percentage												20.00%
Deferred Tax Assets, Net													18,389
Distribution Rights and Customer Lists
Business Acquisition [Line Items]
Acquired finite lived intangible assets										$ 3,300
Federal
Business Acquisition [Line Items]
Deferred Tax Assets, Net													$ 4,400			$ 3,500
Former President and Chief Executive Officer \| Employee Stock Option
Business Acquisition [Line Items]
Term of award	1 year
Former President and Chief Executive Officer \| Restricted Stock Units
Business Acquisition [Line Items]
Term of award	1 year
Former President and Chief Executive Officer \| Performance Shares
Business Acquisition [Line Items]
Term of award	1 year
Maximum
Business Acquisition [Line Items]
Accounts receivables period due												90 days
Weighted average useful life												18 years
Minimum
Business Acquisition [Line Items]
Accounts receivables period due												30 days
Weighted average useful life												2 years
Undamaged product expiration date												12 months
Machinery and equipment \| Maximum
Business Acquisition [Line Items]
Useful life												8 years
Machinery and equipment \| Minimum
Business Acquisition [Line Items]
Useful life												3 years
Building and building improvements
Business Acquisition [Line Items]
Useful life												39 years
Computer software and equipment \| Maximum
Business Acquisition [Line Items]
Useful life												10 years
Computer software and equipment \| Minimum
Business Acquisition [Line Items]
Useful life												3 years