Summary of Significant Accounting Policies (Policies)	9 Months Ended
May 30, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These Consolidated Financial Statements of UniFirst Corporation (the “Company”) included herein have been prepared, without audit, in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. 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 consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended August 30, 2025. 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 results for any future interim periods or for an entire fiscal year.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which enhances effective tax rate reconciliation disclosure requirements and provides clarity to the disclosures of income taxes paid, income before taxes and provision for income taxes. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments in this update should be applied on a prospective basis. Retrospective application is permitted. The Company has evaluated the provisions of this ASU and does not expect its adoption to have a material impact on the Company's consolidated financial statements other than requiring additional income tax disclosures. In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures. The ASU requires a public business entity to provide disaggregated disclosures of certain categories of expenses on an annual and interim basis including purchases of inventory, employee compensation, depreciation, and intangible asset amortization for each income statement line item that contains those expenses. This ASU is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating this ASU to determine its impact on the Company’s disclosures. In September 2025, the FASB issued ASU 2025-06, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. This ASU amends the guidance in ASC 350-40 to modernize the recognition and disclosure framework for internal-use software costs by eliminating the previous “development stage” model and introducing a more principles- and judgment-based approach. ASU 2025-06 is effective for fiscal years beginning after December 15, 2027 and for interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025-06 on its consolidated financial statements. Other recent accounting pronouncements issued by the FASB, including its Emerging Issues Task Force, the American Institute of Certified Public Accountants, and the SEC have not had, or are not believed by management to have, a material impact on the Company’s present or future financial statements.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

May 30, 2026

These Consolidated Financial Statements of UniFirst Corporation (the “Company”) included herein have been prepared, without audit, in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. 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 consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended August 30, 2025. 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 results for any future interim periods or for an entire fiscal year.

Recent Accounting Pronouncements

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which enhances effective tax rate reconciliation disclosure requirements and provides clarity to the disclosures of income taxes paid, income before taxes and provision for income taxes. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments in this update should be applied on a prospective basis. Retrospective application is permitted. The Company has evaluated the provisions of this ASU and does not expect its adoption to have a material impact on the Company's consolidated financial statements other than requiring additional income tax disclosures.

In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures. The ASU requires a public business entity to provide disaggregated disclosures of certain categories of expenses on an annual and interim basis including purchases of inventory, employee compensation, depreciation, and intangible asset amortization for each income statement line item that contains those expenses. This ASU is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating this ASU to determine its impact on the Company’s disclosures.

In September 2025, the FASB issued ASU 2025-06, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. This ASU amends the guidance in ASC 350-40 to modernize the recognition and disclosure framework for internal-use software costs by eliminating the previous “development stage” model and introducing a more principles- and judgment-based approach. ASU 2025-06 is effective for fiscal years beginning after December 15, 2027 and for interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025-06 on its consolidated financial statements.

Other recent accounting pronouncements issued by the FASB, including its Emerging Issues Task Force, the American Institute of Certified Public Accountants, and the SEC have not had, or are not believed by management to have, a material impact on the Company’s present or future financial statements.