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Note 10 - Commitments and Contingencies (Details) - Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities (USD $) In Thousands, unless otherwise specified | Feb. 28, 2015 | Aug. 30, 2014
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Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities [Abstract] |  |
Estimated costs – current dollars | $ 3,536 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear |
Estimated costs – current dollars | 4,940 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear |
Estimated costs – current dollars | 1,663 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear |
Estimated costs – current dollars | 745 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear |
Estimated costs – current dollars | 863 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear |
Estimated costs – current dollars | 12,406 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear |
Estimated costs – current dollars | 24,153 us-gaap_AccrualForEnvironmentalLossContingenciesGross |
Estimated insurance proceeds | (107)unf_EstimatedInsuranceProceedsForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear |
Estimated insurance proceeds | (159)unf_EstimatedInsuranceProceedsForEnvironmentalLossContingenciesUndiscountedDueInSecondYear |
Estimated insurance proceeds | (173)unf_EstimatedInsuranceProceedsForEnvironmentalLossContingenciesUndiscountedDueInThirdYear |
Estimated insurance proceeds | (159)unf_EstimatedInsuranceProceedsForEnvironmentalLossContingenciesUndiscountedDueInFourthYear |
Estimated insurance proceeds | (173)unf_EstimatedInsuranceProceedsForEnvironmentalLossContingenciesUndiscountedDueInFifthYear |
Estimated insurance proceeds | (1,430)unf_EstimatedInsuranceProceedsForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear |
Estimated insurance proceeds | (2,201)unf_EstimatedInsuranceProceedsForEnvironmentalLossContingenciesGross |
Net anticipated costs | 3,429 unf_AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYearNetOfEstimatedInsuranceProceeds |
Net anticipated costs | 4,781 unf_AccrualForEnvironmentalLossContingenciesUndiscountedDueInTwoYearsNetOfEstimatedInsuranceProceeds |
Net anticipated costs | 1,490 unf_AccrualForEnvironmentalLossContingenciesUndiscountedDueInThreeYearsNetOfEstimatedInsuranceProceeds |
Net anticipated costs | 586 unf_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourYearsNetOfEstimatedInsuranceProceeds |
Net anticipated costs | 690 unf_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFiveYearsNetOfEstimatedInsuranceProceeds |
Net anticipated costs | 10,976 unf_AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYearNetOfEstimatedInsuranceProceeds |
Net anticipated costs | 21,952 unf_AccrualForEnvironmentalLossContingenciesNetOfEstimatedInsuranceProceeds |
Effect of inflation | 7,377 unf_AccrualForEnvironmentalLossContingenciesEffectOfInflation |
Effect of discounting | (6,828)us-gaap_AccrualForEnvironmentalLossContingenciesDiscount |
Balance as of February 28, 2015 | $ 22,501 us-gaap_AccrualForEnvironmentalLossContingencies | $ 19,846 us-gaap_AccrualForEnvironmentalLossContingencies

X
- Definition The amount of inflation necessary to increase (reconcile) the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies to the present value recognized on the balance sheet (if the accrual qualifies for inflation). + References No definition available. + Details
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- Definition Accrual for environmental loss contingencies, net of estimated insurance proceeds, total. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid, net of estimated insurance proceeds expected to be received, after the fifth year of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid, net of estimated insurance proceeds expected to be received, in five years of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid, net of estimated insurance proceeds expected to be received, in four years of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid, net of estimated insurance proceeds expected to be received, in three years of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid, net of estimated insurance proceeds expected to be received, in two years of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid, net of estimated insurance proceeds expected to be received, within one year of the balance sheet date. + References No definition available. + Details
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- Definition The estimated aggregate undiscounted amount of the estimated insurance proceeds accrual for environmental loss contingencies as of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received after the fifth year of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within five years of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within four years of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within two years of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within three years of the balance sheet date. + References No definition available. + Details
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- Definition The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within one year of the balance sheet date. + References No definition available. + Details
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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- Definition Undiscounted amount of the accrual for environmental loss contingencies expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 + Details
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- Definition Undiscounted amount of the accrual for environmental loss contingencies expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 + Details
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- Definition Undiscounted amount of the accrual for environmental loss contingencies expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 + Details
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- Definition Undiscounted amount of the accrual for environmental loss contingencies expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 + Details
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