Pension and Savings Plans - Plan's Funded Status and Amounts Recognized in Company's Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 31, 2013
Change in Projected Benefit Obligation:
Projected benefit obligation at beginning of year	$ 300,966	$ 256,780
Interest cost	12,338	13,070	$ 11,746
Actuarial (gains) losses	(1,056)	38,659
Benefits paid	(16,125)	(7,543)
Benefit obligations at end of year	296,123	300,966	256,780
Change in Plan Assets:
Beginning balance	243,407	208,120
Actual return on plan assets	(5,604)	25,920
Employer contributions	17,077	16,910	16,900
Benefits paid	(16,125)	(7,543)
Ending balance	238,755	243,407	$ 208,120
Amount Recognized in the Statement of Financial Position:
Current liabilities	(253)	(192)
Long-term liabilities	(57,115)	(57,367)
Net amount recognized	(57,368)	(57,559)
Amount Recognized in Accumulated Other Comprehensive Loss and not yet reflected in Net Periodic Benefit Cost:
Net actuarial loss	(116,735)	(104,847)
Accumulated other comprehensive loss	(116,735)	(104,847)
Amount Recognized in Accumulated Other Comprehensive Loss and not yet reflected in Net Periodic Benefit Cost and expected to be amortized in next year's Net Periodic Benefit Cost:
Net actuarial loss	(10,506)	(8,941)
Amount recognized	$ (10,506)	$ (8,941)