Employee Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended
	Aug. 30, 2025	Aug. 31, 2024	Aug. 26, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions charged to expense under the plan	$ 15,600,000	$ 20,300,000	$ 18,700,000
Other (income) expense	(400,000)	(600,000)	0
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amounts charged to expense related to the plan	1,600,000	1,700,000	1,700,000
Accumulated benefit obligations	21,700,000	23,400,000
UniFirst Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amounts charged to expense related to the plan	200,000	200,000	100,000
Accumulated benefit obligations	3,000,000.0	3,600,000
Non-qualified Deferred Compensation Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amounts charged to expense related to the plan	1,000,000	800,000	$ 300,000
NQDC Plan assets	4,700,000	3,300,000
NQDC Plan liabilities, current	$ 2,800,000	$ 1,600,000