Summary of Significant Accounting Policies - Schedule of Useful Lives of Property, Plant and Equipment (Details)	Aug. 30, 2025
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	us-gaap:LeaseholdImprovementsMember
Buildings \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Buildings \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Building Components \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Building Components \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years
Machinery and Equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Machinery and Equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Motor Vehicles \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Motor Vehicles \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years

UNIFIRST CORP 10-K