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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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May 31, 2014 | May 31, 2013 | May 31, 2012
Summary of significant components of deferred income tax (benefit) expense from operations |  |  |
Deferred tax expense (benefit) | $ 1,778 ango_DeferredIncomeTaxExpenseBenefitBeforeTaxReformLegislationandNetOperatingLossCarryforward | $ 830 ango_DeferredIncomeTaxExpenseBenefitBeforeTaxReformLegislationandNetOperatingLossCarryforward | $ (1,773)ango_DeferredIncomeTaxExpenseBenefitBeforeTaxReformLegislationandNetOperatingLossCarryforward
Impact of NYS tax reform legislation | 1,173 ango_DeferredIncomeTaxExpensebenefitImpactofNYSTaxReformLegislation | 0 ango_DeferredIncomeTaxExpensebenefitImpactofNYSTaxReformLegislation | 0 ango_DeferredIncomeTaxExpensebenefitImpactofNYSTaxReformLegislation
Net operating loss carryforward | 0 ango_DeferredIncomeTaxNetOperatingLossCarryforwardExpense | 0 ango_DeferredIncomeTaxNetOperatingLossCarryforwardExpense | 1,087 ango_DeferredIncomeTaxNetOperatingLossCarryforwardExpense
Deferred Income Tax Expense (Benefit) | $ 2,951 us-gaap_DeferredIncomeTaxExpenseBenefit | $ 830 us-gaap_DeferredIncomeTaxExpenseBenefit | $ (686)us-gaap_DeferredIncomeTaxExpenseBenefit

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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