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Note 7 - 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 | 6 Months Ended
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Feb. 28, 2015 | Mar. 01, 2014 | Feb. 28, 2015 | Mar. 01, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
As reported - Basic | $ 25,446 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 25,647 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 62,859 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 60,109 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Add: Undistributed earnings allocated to unvested participating shares | 217 us-gaap_UndistributedEarningsDiluted | 329 us-gaap_UndistributedEarningsDiluted | 540 us-gaap_UndistributedEarningsDiluted | 776 us-gaap_UndistributedEarningsDiluted
Less: Undistributed earnings reallocated to unvested participating shares | (205)unf_UndistributedEarningsReallocatedToUnvestedParticipatingShares | (311)unf_UndistributedEarningsReallocatedToUnvestedParticipatingShares | (511)unf_UndistributedEarningsReallocatedToUnvestedParticipatingShares | (734)unf_UndistributedEarningsReallocatedToUnvestedParticipatingShares
Diluted EPS – Common Stock | 25,235 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 25,326 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 62,335 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 59,357 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Diluted EPS – Common Stock (in Shares) | 20,065 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,924 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,028 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,897 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted EPS – Common Stock (in Dollars per share) | $ 1.26 us-gaap_EarningsPerShareDiluted | $ 1.27 us-gaap_EarningsPerShareDiluted | $ 3.11 us-gaap_EarningsPerShareDiluted | $ 2.98 us-gaap_EarningsPerShareDiluted
Common Class A [Member] |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
As reported - Basic | 20,182 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 20,267 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 49,834 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 47,479 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
As reported - Basic (in Shares) | 15,185 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 15,077 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 15,156 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 15,053 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
As reported - Basic (in Dollars per share) | $ 1.33 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 1.34 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 3.29 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 3.15 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Dilutive potential common shares (in Shares) | 139 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 160 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 131 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 154 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Diluted EPS – Common Stock | 25,235 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,326 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 62,335 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 59,357 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Diluted EPS – Common Stock (in Shares) | 20,065 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 19,924 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 20,028 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 19,897 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Diluted EPS – Common Stock (in Dollars per share) | $ 1.26 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 1.27 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 3.11 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 2.98 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 | 5,041 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 5,041 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 12,472 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 11,836 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 | 4,687 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,741 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,690 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
As reported - Basic (in Dollars per share) | $ 1.06 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 1.08 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 2.63 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 2.52 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Dilutive potential common shares | $ 5,041 us-gaap_DilutiveSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 5,041 us-gaap_DilutiveSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 12,472 us-gaap_DilutiveSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 11,836 us-gaap_DilutiveSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Dilutive potential common shares (in Shares) | 4,741 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,687 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,741 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,690 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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