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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2014 | May 31, 2014 | May 31, 2013 | May 31, 2012 | May 31, 2011
Reasons for consolidated income tax provision |  |  |  |  |
Income tax (benefit) provision | $ 3,325 us-gaap_IncomeTaxExpenseBenefit | $ 3,074 us-gaap_IncomeTaxExpenseBenefit | $ (376)us-gaap_IncomeTaxExpenseBenefit | $ (239)us-gaap_IncomeTaxExpenseBenefit | $ 2,559 us-gaap_IncomeTaxExpenseBenefit
Effect of Graduated tax rates |  | 57 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | 16 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | (57)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate |
State income taxes, net of Federal tax benefit |  | (122)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (95)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (152)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |
State income tax credits, net of Federal tax benefit |  | 0 ango_IncomeTaxReconciliationStateAndLocalIncomeTaxesCredits | 23 ango_IncomeTaxReconciliationStateAndLocalIncomeTaxesCredits | 69 ango_IncomeTaxReconciliationStateAndLocalIncomeTaxesCredits |
Impact of Non US operations |  | 27 ango_IncomeTaxReconciliationEffectOfForeignOperations | 228 ango_IncomeTaxReconciliationEffectOfForeignOperations | (46)ango_IncomeTaxReconciliationEffectOfForeignOperations |
Tax-exempt interest |  | 0 us-gaap_IncomeTaxReconciliationTaxExemptIncome | 2 us-gaap_IncomeTaxReconciliationTaxExemptIncome | 4 us-gaap_IncomeTaxReconciliationTaxExemptIncome |
Research and development tax credit |  | 236 us-gaap_IncomeTaxReconciliationTaxCreditsResearch | 142 us-gaap_IncomeTaxReconciliationTaxCreditsResearch | 115 us-gaap_IncomeTaxReconciliationTaxCreditsResearch |
Domestic Production Activities deduction |  | 0 us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | 0 us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | 71 us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities |
Nondeductible acquisition costs |  | 0 ango_IncomeTaxReconciliationNondeductibleExpenseAcquisitionCosts | (110)ango_IncomeTaxReconciliationNondeductibleExpenseAcquisitionCosts | (1,144)ango_IncomeTaxReconciliationNondeductibleExpenseAcquisitionCosts |
Nondeductible interest on contingent payments |  | (540)ango_IncomeTaxReconciliationNondeductibleInterestOnContingentPayment | (130)ango_IncomeTaxReconciliationNondeductibleInterestOnContingentPayment | 0 ango_IncomeTaxReconciliationNondeductibleInterestOnContingentPayment |
Nontaxable gain on revaluation of contingent consideration liability |  | 1,698 ango_IncomeTaxReconciliationGainonRevaluationofContingentConsiderationLiability | 0 ango_IncomeTaxReconciliationGainonRevaluationofContingentConsiderationLiability | 0 ango_IncomeTaxReconciliationGainonRevaluationofContingentConsiderationLiability |
Tax law change |  | (1,173)ango_EffectiveIncomeTaxRateReconciliationTaxLawChange | 0 ango_EffectiveIncomeTaxRateReconciliationTaxLawChange | 0 ango_EffectiveIncomeTaxRateReconciliationTaxLawChange |
Effect of elimination of ASC 718 APIC pool |  | (440)ango_IncomeTaxReconciliationEffectofEliminationofASC718APICPool | 0 ango_IncomeTaxReconciliationEffectofEliminationofASC718APICPool | 0 ango_IncomeTaxReconciliationEffectofEliminationofASC718APICPool |
Nondeductible stock-based compensation |  | (176)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | (108)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | (125)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost |
Other nondeductible expenses |  | (384)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | (336)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | (336)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther |
Overaccrual (underaccrual) of prior year Federal and state taxes |  | (249)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | 10 us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | 138 us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes |
Fully reserved capital losses |  | 0 ango_IncomeTaxReconciliationFullyReservedCapitalLosses | 179 ango_IncomeTaxReconciliationFullyReservedCapitalLosses | (208)ango_IncomeTaxReconciliationFullyReservedCapitalLosses |
Other |  | 0 us-gaap_IncomeTaxReconciliationOtherAdjustments | 0 us-gaap_IncomeTaxReconciliationOtherAdjustments | 12 us-gaap_IncomeTaxReconciliationOtherAdjustments |
Income tax (benefit) provision at statutory tax rate of 35% |  | $ 2,008 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (555)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (1,898)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |

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- Definition The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to the impact of non US operations. + References No definition available. + Details
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- Definition The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to state and local tax credits. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32059-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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