Pension and Savings Plans - Change in Fair Value of Level 3 Assets (Detail) $ in Thousands	12 Months Ended
	Aug. 29, 2015 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Beginning balance	$ 243,407
Actual return on plan assets:
Ending balance	238,755
Level 3 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Beginning balance	803
Actual return on plan assets:
Assets held	(134)
Assets sold during the year	(74)
Sales and settlements	(288)
Ending balance	$ 307