Employee and Retiree Benefits (Postretirement Health Care and Deferred Compensation Benefits) (Details) - USD ($) $ in Thousands	May 28, 2016	Aug. 29, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Postretirement health care benefit cost	$ 5,556	$ 34,535
Non-qualified deferred compensation	18,360	19,508
Executive share option plan liability	3,593	4,788
SERP benefit liability	2,497	2,649
Executive deferred compensation	371	299
Officer stock-based compensation	204	242
Total postretirement health care and deferred compensation benefits	30,581	62,021
Less current portion	(4,593)	(4,931)
Postretirement health care and deferred compensation benefits	$ 25,988	$ 57,090