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Document And Entity Information (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 27, 2011 | Feb. 25, 2011 | Oct. 14, 2011 Common Class A [Member] | Oct. 14, 2011 Common Class B [Member]
Entity Information [Line Items] |  |  |  |
Entity Registrant Name | UNIFIRST CORP |  |  |
Entity Central Index Key | 0000717954 |  |  |
Current Fiscal Year End Date | --08-27 |  |  |
Entity Well-known Seasoned Issuer | Yes |  |  |
Entity Voluntary Filers | No |  |  |
Entity Current Reporting Status | Yes |  |  |
Entity Filer Category | Large Accelerated Filer |  |  |
Entity Public Float |  | $ 801,785,035 |  |
Entity Common Stock, Shares Outstanding |  |  | 14,989,871 | 4,885,277
Document Fiscal Year Focus | 2011 |  |  |
Document Fiscal Period Focus | FY |  |  |
Document Type | 10-K |  |  |
Amendment Flag | false |  |  |
Document Period End Date | Aug. 27, 2011 |  |  |

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