Employee and Retiree Benefits (Postretirement Benefit Income) (Details) $ in Thousands	12 Months Ended
Aug. 26, 2017 USD ($)
Retirement Benefits [Abstract]
Interest cost	$ 29
Service cost	16
Amortization of prior service benfit	(40,444)
Amortization of net actuarial loss	15,648
Net periodic postretirement benefit income	$ (24,751)

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