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Employee Benefit Plans	3 Months Ended
Employee Benefit Plans	Nov. 25, 2017
Postemployment Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Defined Contribution Retirement Savings Plan The Company has a defined contribution retirement savings plan with a 401(k) feature for all eligible U.S and Canadian employees not under collective bargaining agreements. The Company matches a portion of the employee’s contribution and may make an additional contribution at its discretion. Contributions charged to expense under the plan for the thirteen weeks ended November 25, 2017 and November 26, 2016 were $4.1 million and $3.6 million, respectively. Pension Plans and Supplemental Executive Retirement Plans The Company maintains an unfunded Supplemental Executive Retirement Plan for certain eligible employees of the Company, a non-contributory defined benefit pension plan covering union employees at one of its locations, and a frozen pension plan the Company assumed in connection with its acquisition of Textilease Corporation in fiscal 2004. The amounts charged to expense related to these plans for the thirteen weeks ended November 25, 2017 and November 26, 2016 were $0.7 million and $0.9 million, respectively.