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Note 16 - Subsequent Events (Details) (Subsequent Event [Member], Floating Rate Note [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended
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Sep. 14, 2013
Subsequent Event [Member] | Floating Rate Note [Member] |
Note 16 - Subsequent Events (Details) [Line Items] |
Repayments of Debt (in Dollars) | $ 100.0
Debt Instrument, Basis Spread on Variable Rate | 0.50%

X
- Details
Name: | unf_Note16SubsequentEventsDetailsLineItems
Namespace Prefix: | unf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration