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Employee Benefit Plans - Expected Benefit Payments (Details) - USD ($) $ in Thousands | Aug. 30, 2025 | Aug. 31, 2024 | Aug. 26, 2023
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UniFirst Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
2026 | $ 757 |  |
2027 | 97 |  |
2028 | 157 |  |
2029 | 219 |  |
2030 | 198 |  |
Thereafter | 1,576 |  |
Total benefit payments | 3,004 | $ 3,609 | $ 3,549
SERP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
2026 | 1,738 |  |
2027 | 1,736 |  |
2028 | 1,673 |  |
2029 | 1,768 |  |
2030 | 1,557 |  |
Thereafter | 15,007 |  |
Total benefit payments | $ 23,479 | $ 25,880 | $ 25,119

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