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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Income Statement [Abstract]
Net sales	$ 354,425us-gaap_SalesRevenueNet	$ 341,916us-gaap_SalesRevenueNet	$ 221,917us-gaap_SalesRevenueNet
Cost of sales	174,757us-gaap_CostOfGoodsSold	173,402us-gaap_CostOfGoodsSold	96,608us-gaap_CostOfGoodsSold
Gross profit	179,668us-gaap_GrossProfit	168,514us-gaap_GrossProfit	125,309us-gaap_GrossProfit
Operating expenses
Research and development	27,486us-gaap_ResearchAndDevelopmentExpense	26,319us-gaap_ResearchAndDevelopmentExpense	20,511us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	83,200us-gaap_SellingAndMarketingExpense	76,121us-gaap_SellingAndMarketingExpense	64,505us-gaap_SellingAndMarketingExpense
General and administrative	26,639us-gaap_GeneralAndAdministrativeExpense	26,186us-gaap_GeneralAndAdministrativeExpense	19,033us-gaap_GeneralAndAdministrativeExpense
Amortization of intangibles	16,622us-gaap_AmortizationOfIntangibleAssets	16,617us-gaap_AmortizationOfIntangibleAssets	9,309us-gaap_AmortizationOfIntangibleAssets
Change in fair value of contingent consideration	(1,808)ango_ChangeInFairValueOfContingentConsideration	1,583ango_ChangeInFairValueOfContingentConsideration	0ango_ChangeInFairValueOfContingentConsideration
Acquisition, restructuring and other items, net	10,760ango_AcquisitionRestructuringAndOtherItemsNet	13,800ango_AcquisitionRestructuringAndOtherItemsNet	15,859ango_AcquisitionRestructuringAndOtherItemsNet
Medical device excise tax	3,829ango_MedicalDeviceExciseTax	1,600ango_MedicalDeviceExciseTax	0ango_MedicalDeviceExciseTax
Total operating expenses	166,728us-gaap_OperatingExpenses	162,226us-gaap_OperatingExpenses	129,217us-gaap_OperatingExpenses
Operating income (loss)	12,940us-gaap_OperatingIncomeLoss	6,288us-gaap_OperatingIncomeLoss	(3,908)us-gaap_OperatingIncomeLoss
Other (expenses) income
Interest income	0us-gaap_InvestmentIncomeInterest	103us-gaap_InvestmentIncomeInterest	1,090us-gaap_InvestmentIncomeInterest
Interest expense	(3,656)us-gaap_InterestExpense	(5,271)us-gaap_InterestExpense	(508)us-gaap_InterestExpense
Other expense	(3,544)us-gaap_OtherNonoperatingExpense	(2,707)us-gaap_OtherNonoperatingExpense	(2,096)us-gaap_OtherNonoperatingExpense
Total other expenses, net	(7,200)us-gaap_OtherNonoperatingIncomeExpense	(7,875)us-gaap_OtherNonoperatingIncomeExpense	(1,514)us-gaap_OtherNonoperatingIncomeExpense
Income (loss) before income tax expense (benefit)	5,740us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(1,587)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(5,422)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense (benefit)	3,074us-gaap_IncomeTaxExpenseBenefit	(376)us-gaap_IncomeTaxExpenseBenefit	(239)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ 2,666us-gaap_NetIncomeLoss	$ (1,211)us-gaap_NetIncomeLoss	$ (5,183)us-gaap_NetIncomeLoss
Earnings per share
Basic (usd per share)	$ 0.08us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ (0.20)us-gaap_EarningsPerShareBasic
Diluted (usd per share)	$ 0.08us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ (0.20)us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding (in shares)	35,135,689us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	34,817,279us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	25,382,293us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average shares outstanding (in shares)	35,439,850us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	34,817,279us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	25,382,293us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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