Basis of Presentation	9 Months Ended
Basis of Presentation	May 28, 2011
Notes To Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation These Consolidated Financial Statements of UniFirst Corporation (the "Company") have been prepared, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States ("US GAAP") have been condensed or omitted pursuant to such rules and regulations; however, the Company believes that the information furnished reflects all adjustments (consisting only of normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of results for the interim period. It is suggested that these Consolidated Financial Statements be read in conjunction with the financial statements and the notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended August 28, 2010. There have been no material changes in the accounting policies followed by the Company during the current fiscal year. Results for an interim period are not indicative of any future interim periods or for an entire fiscal year.

Description containing the entire organization, consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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