Employee and Retiree Benefits (Postretirement Health Care and Deferred Compensation Benefits) (Details) - USD ($) $ in Thousands	Nov. 28, 2015	Aug. 29, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Postretirement health care benefit cost	$ 5,905	$ 34,535
Non-qualified deferred compensation	19,092	19,508
Executive share option plan liability	4,196	4,788
SERP benefit liability	2,694	2,649
Executive deferred compensation	376	299
Officer stock-based compensation	255	242
Total postretirement health care and deferred compensation benefits	32,518	62,021
Less current portion	(4,649)	(4,931)
Postretirement health care and deferred compensation benefits	$ 27,869	$ 57,090