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Note 7 - Net Income Per Share (Details) - Summary of Earnings Per Share Basic 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, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income | $ 25,446 us-gaap_NetIncomeLoss | $ 25,647 us-gaap_NetIncomeLoss | $ 62,859 us-gaap_NetIncomeLoss | $ 60,109 us-gaap_NetIncomeLoss
Allocation of net income for Basic | 25,446 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 25,647 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 62,859 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 60,109 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average number of shares for Basic (in Shares) | 20,118 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 20,052 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 20,089 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 20,031 us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Common Class A [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Allocation of net income for 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
Weighted average number of shares for Basic (in Shares) | 15,185 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 15,077 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 15,156 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 15,053 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Earnings per share for 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
Common Class B [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Allocation of net income for 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
Weighted average number of shares for Basic (in Shares) | 4,741 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,687 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,741 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4,690 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Earnings per share for 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
Unvested Participating Shares [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Allocation of net income for Basic | $ 223 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = unf_UnvestedParticipatingSharesMember | $ 339 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = unf_UnvestedParticipatingSharesMember | $ 553 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = unf_UnvestedParticipatingSharesMember | $ 794 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = unf_UnvestedParticipatingSharesMember
Weighted average number of shares for Basic (in Shares) | 192 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = unf_UnvestedParticipatingSharesMember | 288 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = unf_UnvestedParticipatingSharesMember | 192 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = unf_UnvestedParticipatingSharesMember | 288 us-gaap_WeightedAverageNumberOfSharesIssuedBasic / us-gaap_StatementClassOfStockAxis = unf_UnvestedParticipatingSharesMember

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2646-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 + Details
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