Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Aug. 31, 2013	Aug. 25, 2012
Income Tax Disclosure [Abstract]
Deferred taxes are not provided for temporary differences	$ 260,000,000	$ 195,800,000
Deferred tax assets from net operating loss carryforwards	8,700,000	12,300,000
Future taxable income	75,500,000	76,600,000
Expiration date of NOLs start year	2014
Expiration date of NOLs end year	2032
Deferred tax assets for income tax credit carryforwards	33,100,000	24,300,000
Expiration date of tax credit carryforwards start year	2014
Expiration date of tax credit carryforwards end year	2027
Operating loss carryforwards expiration period description	Fiscal 2014 through 2032
Other tax credit carryforwards expiration period description	Fiscal 2014 through 2027
Valuation allowances on deferred tax assets	11,593,000	9,532,000
Increase in valuation allowance	2,100,000
Unrecognized tax benefits , if recognized would reduce effective tax rate, amount	20,100,000
Accrued for payment of interest and penalties associated with unrecognized tax benefits	4,700,000	4,100,000
Amount of unrecognized tax benefits that could be reduce over next twelve months	$ 1,500,000