Pension and Savings Plans - Plan's Funded Status and Amounts Recognized in Company's Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 30, 2014	Aug. 31, 2013	Aug. 25, 2012
Change in Projected Benefit Obligation:
Projected benefit obligation at beginning of year	$ 256,780	$ 305,206
Interest cost	13,070	11,746	12,214
Actuarial losses (gains)	38,659	(53,756)
Benefits paid	(7,543)	(6,416)
Benefit obligations at end of year	300,966	256,780	305,206
Change in Plan Assets:
Beginning balance	208,120	181,409
Actual return on plan assets	25,920	16,218
Employer contributions	16,910	16,909	15,423
Benefits paid	(7,543)	(6,416)
Ending balance	243,407	208,120	181,409
Amount Recognized in the Statement of Financial Position:
Current liabilities	(192)	(124)
Long-term liabilities	(57,367)	(48,536)
Net amount recognized	(57,559)	(48,660)
Amount Recognized in Accumulated Other Comprehensive Loss and not yet reflected in Net Periodic Benefit Cost:
Net actuarial loss	(104,847)	(83,601)
Accumulated other comprehensive loss	(104,847)	(83,601)
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	(8,941)	(6,879)
Amount recognized	$ (8,941)	$ (6,879)