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Cover - USD ($)	12 Months Ended
Cover - USD ($)	Aug. 29, 2026	Oct. 20, 2026	Feb. 27, 2026
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Aug. 29, 2026
Current Fiscal Year End Date	--08-29
Document Transition Report	false
Entity File Number	001-08504
Entity Registrant Name	UNIFIRST CORPORATION
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-2103460
Entity Address, Address Line One	68 Jonspin Road
Entity Address, City or Town	Wilmington
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01887
City Area Code	(978)
Local Phone Number	658-8888
Title of 12(b) Security	Common Stock, $0.10 par value per share
Trading Symbol	UNF
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 3,361,249,642
Documents Incorporated by Reference	Documents Incorporated By Reference The Registrant intends to file a Definitive Proxy Statement pursuant to Regulation 14A promulgated under the Securities Exchange Act of 1934, as amended, for its 2027 Annual Meeting of Shareholders within 120 days of the end of the fiscal year ended August 29, 2026. Portions of such Proxy Statement are incorporated by reference in Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0000717954
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		14,586,347
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,501,265