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Note 12 - Shareholders' Equity (Details) | 12 Months Ended
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Aug. 30, 2014
Common Class A [Member] |
Note 12 - Shareholders' Equity (Details) [Line Items] |
Common Stock, Voting Rights, Number of Votes | 1
Common Stock, Dividend Rate, Percentage | 125.00%
Common Class B [Member] |
Note 12 - Shareholders' Equity (Details) [Line Items] |
Common Stock, Voting Rights, Number of Votes | 10
Conversion of Stock, Shares Converted (in Shares) | 12,758

X
- Definition The percentage rate used to calculate dividend payments on common stock. + References No definition available. + Details
Name: | unf_CommonStockDividendRatePercentage
Namespace Prefix: | unf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of votes per common share owned. + References No definition available. + Details
Name: | unf_CommonStockVotingRightsNumberOfVotes
Namespace Prefix: | unf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | unf_Note12ShareholdersEquityDetailsLineItems
Namespace Prefix: | unf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_ConversionOfStockSharesConverted1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration