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Note 6 - Net Income Per Share (Details) - Summary of Earnings Per Share Diluted Two Class Method (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Nov. 29, 2014 | Nov. 30, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
As reported - Basic | $ 37,413 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 34,462 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Add: Undistributed earnings allocated to unvested participating shares | 323 us-gaap_UndistributedEarningsDiluted | 447 us-gaap_UndistributedEarningsDiluted
Less: Undistributed earnings reallocated to unvested participating shares | (305)unf_UndistributedEarningsReallocatedToUnvestedParticipatingShares | (422)unf_UndistributedEarningsReallocatedToUnvestedParticipatingShares
Diluted EPS – Common Stock | 37,101 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 34,031 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Diluted EPS – Common Stock (in Shares) | 20,008 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,891 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted EPS – Common Stock (in Dollars per share) | $ 1.85 us-gaap_EarningsPerShareDiluted | $ 1.71 us-gaap_EarningsPerShareDiluted
Common Class A [Member] |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
As reported - Basic | 29,649 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 27,208 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
As reported - Basic (in Shares) | 15,128 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 15,029 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
As reported - Basic (in Dollars per share) | $ 1.96 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 1.81 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Effect of dilutive potential common shares (in Shares) | 139 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 169 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Diluted EPS – Common Stock | 37,101 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 34,031 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Diluted EPS – Common Stock (in Shares) | 20,008 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 19,891 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Diluted EPS – Common Stock (in Dollars per share) | $ 1.85 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 1.71 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class B [Member] |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
As reported - Basic | 7,434 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 6,798 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
As reported - Basic (in Shares) | 4,741 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,693 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
As reported - Basic (in Dollars per share) | $ 1.57 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 1.45 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Effect of dilutive potential common shares | $ 7,434 us-gaap_DilutiveSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 6,798 us-gaap_DilutiveSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Effect of dilutive potential common shares (in Shares) | 4,741 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,693 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

X
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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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