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Employee Benefit Plans	9 Months Ended
Employee Benefit Plans	May 26, 2018
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 May 26, 2018 and May 27, 2017 were $5.4 million and $3.7 million, respectively. Contributions charged to expense under the plan for the thirty-nine weeks ended May 26, 2018 and May 27, 2017 were $13.5 million and $11.0 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 and two frozen non-contributory defined benefit pension plans. The amounts charged to expense related to these plans for the thirteen weeks ended May 26, 2018 and May 27, 2017 were $0.6 million and $0.9 million, respectively. The amounts charged to expense related to these plans for the thirty-nine weeks ended May 26, 2018 and May 27, 2017 were $1.9 million and $2.6 million respectively.